@@ConquerDriving That's right, it was designed to last for 15 years and has done 21 years so far. NASA said it should last until 2030, however it is showing its age. Still, it's done well.
I learned driving by watching this channel. I cleared all my doubt. Then my driving was perfect. My driving teacher said you improve so fast. Thanku so much for the videos ❤️❤️❤️❤️❤️❤️
Engineering Explained did a really good video on this as well, definitely worth checking out if anyone wants a slightly more technical breakdown of what's happening in both cases. This was a good video nonetheless :)
No he didn't because the trip computer doesn't really have any idea how much is saved or what is going on it's all estimated. If you want an accurate picture of what was going on then he would have measured the fuel each time. It's actually a total fail
@@elixier33 I said he did a good video explaining what's happening, not on exactly how much fuel he's saved. The trip computers have access to the injector pulse durations (and thus fuel quantities since this will be characterised during manufacturing), deviations, aging information, etc. As a result the trip computer will have plenty enough information to give an accurate enough estimation of instantaneous fuel economy. This is what he used to illustrate that a car rolling in gear down a hill is using less fuel than the same car rolling down the same hill in neutral. It shouldn't take much for someone to extrapolate from that that he'd be using less fuel long term by not coasting. You're correct though that to quantify the exact volume of fuel saved, he'd have to do a tank fill-up comparison; however, that's not what he was doing, nor is it necessary to illustrate the point, as I explained above.
I know coasting is necessary at very low speeds but I personally would rather sacrifice a bit of mpg for more control of the car. Great channel and Videos btw 😀.
@@ksrele it was this vid: ''How to drive economically - Save money on fuel!'' (Rich set a challenge to get 56mpg during a drive, when it was during lockdown) :)
I regularly do a route across mid Wales, about 100 miles. Tried several times to coast down the long down hills in neutral - when it was safe. Fuel consumption was always worse than if I drove normally, modern engines detect load and acceleration and hold back on fuel delivery more than if your car is just at idle.
I use a mixed approach. If clutch-coasting serves my purpose better, I do that. If engine-braking serves my purpose better, I do that. I only use the brakes when necessary, and almost never ride my brakes.
Thank you for making this video! As a hypermiler, I coast all the time and it works for me. People seem to think that coasting always uses more fuel since the engine is idling instead of in decel fuel cutoff, but they ignore the fact that engine braking also slows the car down just like riding the brakes does which isn't usually wanted when hypermiling. Coasting a long distance getting several hundred MPG can add more to your average than engine braking for a short distance using no fuel. But of course stay in gear and take advantage of decel fuel cutoff if you need to slow down or not pick up too much speed, no reason to coast if you are going to be braking. When people say I'm wrong and don't believe my test results, now I have an excellent video to point them to :)
You are correct. Coasting can definitely save fuel in the correct set of circumstances, but not all circumstance. Many people feel coasting is dangerous which is another reason some may not like it. But if you know what you're doing it can actually be a more economical way to drive and just as safe.
Exactly, I'm a newbie but I refuse to believe that putting the car off gear doesn't lead to fuel economy, it's just one of those common sense things. And they keep saying this all in the name of safety. Speed is what's dangerous, not coasting. Although, I don't know about new cars with electronics, for those it might be a thing, but not for older cars.
@@Oxymorone7 Yup. Coasting can definitely save fuel in some circumstances, but not all. Unless coasting is causing someone to pick up too much speed and brake a lot, which isn't when coasting would be beneficial anyways, I don't see any safety hazard. People say the driver loses control when coasting because they won't be able to accelerate immediately, but being in a high gear isn't going to be much better. Realistically, if fast acceleration is needed, downshifting will usually be necessary. Shifting from, for example, 6th gear to 3rd gear for maximum acceleration isn't going to be any faster than shifting back into gear from neutral. But with automatic transmissions, especially ones with a significant delay going back into gear, that could certainly be a valid argument.
Explained very well. Engine compression braking certainly works a lot better with modern injection units being able to completely shut off. It's rare to hear exhaust popping from unburnt fuel when cars pass you downhill these days. This is the main reason why I favour braking in one gear until I reach idle, or selecting a gear just before needing to apply the gas.
One small correction you may be interested in. The compression doesn't actually cause the engine braking as it's equalled out by the expansion of another piston. It's actually the vacuum created from piston to closed throttle body that causes the majority of the braking. It's technically vacuum braking. I used to believe it was compression also until I found out otherwise.
@@ConquerDriving Yes, you are correct and I'm fully aware of this. I use the term very loosely without opening a can of worms and getting into a full dissertation on the subject🤣. I refer to this method alot when explaining old school braking through the gears. Back in the days with carburettor cars, as they naturally had an overrun and therefore require the induction to be almost cut off. Although still true with modern cars, they also have the ability of a "no power stroke" to cancel the compression stroke. Due to the fact the fuel is cut off. Hence, no reason to brake through all the gears. Plus, it all gets messy when we start to consider kadence effect, inertial/angular momentum and so on. Also, older diesel engines didn't have a throttle body, so it was simply managed through the fuel starvation and stoichiometric ratio. Since the introduction of Egr regulation systems, turbos etc, this has all now changed. Another argument that pops up alot is, why don't diesels have good engine braking considering the compression ratio is higher than petrol cars? Consequently, the "vacuum princible" does explain this well.
I live in the US so I usually only coast in neutral coming off freeway or highway exits, and sometimes when I know I'm coming up to a full stop like a stop sign or long red light for example. It's extremely flat in the state I live but even for other US drivers I think this is helpful because many of them will throw it in neutral on almost any decline and could end up being dangerous.
I'm surprised you actually drive a manual as many many many people in North America don't! Automatic gearing is the norm over there where in the UK, manual gear shifting is the norm, we actually have different driving tests for it. If you pass the Auto test you can only drive Automatic cars where if you pass the Manual test, you can drive both types. Its another reason why when hiring an Auto in the UK costs slightly more as there is much much less of a demand to use one (Cheaper to hire a Manual).
@@CrazyInWeston It's true, manual driving is a rare skill in the US. Automatics are the norm, and there is only a very limited selection of car models available with a manual transmission option. I had always wanted to learn to drive stick, because it looks fun. So, I actually bought a brand new car a couple years ago, a 2020 Toyota Corolla hatchback. The dealership had to deliver it to my house after I wrote the check, because I couldn't drive it. I taught myself to drive the car by watching UA-cam videos, especially those on this channel. There are no driving schools in my city that teach manual, so I was on my own. I don't know if any states have special tests or licenses for manual driving. I live in Ohio, and there is no special test here based on the transmission of the car. After buying the Corolla, all I needed to do was register the car and buy plates. I did not need to take a test or get a new designation on my driver's license. By the way, I kept my automatic car, so it's nice having both an automatic and a manual. I'm 37 years old, female, by the way.
I feel like teaching learners to drive economically would actually benefit them a lot, especially financial. Like I have a 1.4 TDI VW Polo. If I do my route to work and I make an effort to be efficient. I can achieve 90-100 mpg over a 14 mile trip. Meaning the whole journey uses under a litre of fuel. If you drive carefully all the time. The savings really so add up , especially in the current fuel situation. But admittedly, not everyone has the patience or time to hypermile consistently
@@ConquerDriving exactly why I bought it, I went from North Wales to Manchester today. 92.5 mpg. Incredible really. I’ve had it 6 months and it’s been solid
I've been trying this with my automatic over the last two weeks. Using my bmw's mpg gauge - I saved 2-3mpg more but my attention was no longer on the road so I am stopping this test. Just go easy on the throttle & I'll be OK. Coasting is only justified when you are just about to run out of fuel !
8:40 You only went there for the meme did you 😂 Anyway, thanks for your videos, as someone who's had a driving licence (but not much experience) for a while now but only recently moved to the UK they're super helpful for me. Greetings from a fellow MX-5 driver!
The problem with coasting is when a road situation suddenly changes, so that you have to IMMEDIETALY speed up, then if you're slow with gear changing, I wouldn't suggest using it at all and when experienced I'd suggest doing it only in places, which you know well.
I think he addressed that in the last few minutes, in that for a lot of small cars, the gear they're engine braking in has poor torque anyways, and have to change gears to get enough power to get anywhere fast. In that case, the difference between 5 -> 3 and N -> 3 is not that big.
The times I've needed to immediately speed up (1: accidentally pulled out in front of a tractor, 2: van driver doing 19 mph down the M4 finally pulled onto the hard shoulder) had no use for coasting.
Bilt Hamber toucheless snow foam and spray off Karcher or other in 5. Nice new white MX5 Richard !!!! Just drive at 12-18 mph on wet roads to filming location to stop the new dirt spray!!!
For me (I'm from Serbia) is much logical to measure fuel consumption in l/100km so lower number is better, and my car (VW Tiguan) can measure consumption even when is stationary, the unit is l/h then. And when I left car in gear and let off the gas pedal it is showing me 0 l/100km. One more thing: coasting with car in neutral is not safe for breaking. If you lose your breaks for any reason (break fluid leek for example) if car is in gear engine will help you break, but if car is in neutral it will be very hard to put it in gear again if the car starts to speed up on downhill.
Wouldn't this only apply if you lose brakes and have a open strech of road for you to slow down using engine braking? Probability of hitting that conditions is pretty low as: 1) There mostly always is traffic on the road. 2) Other drivers almost always assume you have breaking and base there driving decisions on that. The only difference between the two is that when coasting in neural and you lose breaking, you should have the ability (or smarts/quick thinking) to select the right gear and then keep downshifting if immediately required. Am I missing something here?
can you please film yourself in different driving situations, in city traffic, in fast bends, parking and commentate what you are thinking and some tips in those situations would be good too! thanks richard!
I was told when you start a manual car to never give it gas while clutch is down. Always find the bite point first and give it gas as you slowly let go of the clutch.
One parameter that you totally forgot was hybrid vehicles. When coasting or motor breaking (regenerative braking), both cases alike, I don't even use the ICE, hence no fuel being used.
This series is for young/new drivers who typically have an inexpensive petrol vehicle with a standard gearbox. No new driver is buying an EV/hybrid as a first car with their own money.
@N1withaskillet Why not? Hybrid is getting mainstream. There are lots of cheap Toyota Hybrids out there. About EV:s, sure, the really low-end market is several years away, but used, long-mile low-price hybrids are everywhere.
I think if you need to use the accelerator to go down a hill you could roll down for free you are wasting fuel. If you roll down the hill too fast, then put it in the lowest gear you don't have to use the accelerator to go the speed you want.
neutral while idle take around 0,7Liter/1hour 750rpm cca . So if we move 50kmh in neutral our fuel consumption is around 1,8Liter/100 km (when you coastin and NOT idling it take your engine to like 1000 rpm) . so 1,8liter / 100 km in € is around 2,88€ per 100 km . You know who is driving 2,80€ per 100km ? , electric cars . So when u r coasting u basicly have electric car fuel consumption . BUT! cheaper is not coasting , but left gear there and u might safe around 15-30% .Imagine yearly gas will cost you not 1000€ but 700€ .
What about traction? The wheels are disconnected from the engine and there is no drive going through them. It must be unsafe to corner at speed while coasting. Good break down all things considered! I tend to debate about this one in the comment sections too 😅
Coasting makes no difference to traction. It takes away engine braking and your ability to accelerate. I hope you're OK. What part of Ukraine are you in?
@@ConquerDriving I'm in Kyiv, I am safe. Thank you for your concern. I study at university online, go to the grocery store, look for a job, so it is fairly normal now. Air raid sirens go off much more rarely than they used to in the first four weeks. Many have suffered and keep suffering much more than me. I hope the ones responsible will be held accountable for their heinous actions. Britain helps us a lot. Boris Johnson visited Kyiv recently, so it will all be alright :)
@@ConquerDriving I thought it made a difference in traction, but not physical though. As in obviously tyre traction is the same, but wheels are disconnected from each other. Anyway the point of the video was fuel economy, but I don't think I'll be using coasting in this manner. Also, an area where people lose fuel to coasting is when they approach traffic lights for example, or junction where they know the will stop for some time. They put it in neutral and coast. In gear the car would be using no fuel and would reduce brake wear. But you've talked about it loads.
I'm glad to hear you're OK and things are getting better. I'm hoping the fighting will stop soon. As for loss of traction from the wheels being disconnected, I've never noticed a difference. I personally don't coast at speed but it can be more fuel efficient. I do use neutral a lot in traffic though as it save my leg and my clutch. But only at low speeds where engine braking would be happening anyway.
So what if the car stops while youre in neutral and moving? Dont you lose control? Dangerous? Ive always told people to never use neutral when youre driving down a hill if engine will stop you are out of control. It seems like worst practice when talking about safety at the road. Edit: Ah you mention this at the end. 👍👍👍
After watching this at least I came to the conclusion that a momentary fuel consumption of 0.0l/100km shown while coasting is a sweat little lie, since that means an idle engine would have to reach way over 5000 mpg to honestly round down to zero.
I wonder why the UK uses L for fule and pounds per L for fule price, but mph for speed and mpg for fule economy. Is it annoying to convert between them when determining pounds per mile in terms of cost of divining?
Thanks for your time and wonderful videos as a learner I some times don’t know which line I should use especially in new places that there isn’t any mark in the road . Can you please make a video ? thanks
Thank you. Unfortunately sometimes it's impossible to know which lane you should use. But I may do a video on it in the future to help. This video may help though: ua-cam.com/video/4OdZYIoq9po/v-deo.html
Coasting saves a lot fuel when you drive at low speed, bellow 15 mph. At this speed, your engine is spinning a lot faster than the wheels because of low gears, and engine braking on second/first gear is too strong to be beneficial, and coasting will be a lot better for your mileage, if you drive at low speed often
Ive passed my theory last week (45/50 and 58/75) after failing twice. However, i have no plans to do drivig lessons for a while (for at least four months or even years) as its so expensive (at least £27-40/per hour) to learn and drive. I also dont want to drive in a car withoput dual controls. I might even do my theory again cause i didnt knwo it expires after 23 months (just under two year).
Learning to drive is expensive, the more practise you can get with a supervisor the cheaper it is. It's very sensible not to start in a car that doesn't have dual controls.
Do you have a relative or friend who could help you get started in an empty parking lot? That's pretty much our only choice here in the U.S. (If you can find a manual driving school, the lessons are $100 an hour).
Does the car have to burn extra fuel to cancel the force slowing down the car by releasing the pedal that wouldn't have been burned if you were in neutral? That's why I thought if you were driving in a lower gear the engine is just "fighting" itself using extra fuel to cancel an engine resistance force I don't need. I suppose opening the throttle would move some of the losses out the way. If you have to slow at the bottom of hills (or keep braking to maintain a safe speed) it's worth just staying in gear to remove the idling losses unless you turn off the engine when going in neutral, which will make the brakes less effective after a few uses. I did have a Citroen C2 that didn't engage DFCO until over 2000 rpm so sometimes I'd alternate between a low gear and coasting. Coming down the hill to Llanfihangel Nant Melan is a good example because it's a long hill with a 40 at the bottom, so unless you're going to blow through the 40 like a sinner, you are better off staying in gear and it only scrubs a bit of speed off the descent and you're still over the speed limit at the bottom. Also the hills going down into town from Bath university. You'll get to 40 on a bicycle in a 30 on the least steep hill (the others I chickened out and used the brake due to not trusting traffic conditions). So I imagine a car could get rolling to 100+ if you could keep it on the road round the corners and you didn't cause an accident. Also there is a roundabout at the bottom. So that is another hill you'd probably stay in 2nd or 3rd, though electric car owners will get a decent bit of charge back in the battery descending the 150 metres of elevation.
My bmw 2 series turns the engine off when coasting, it does it automatically when you lift off the accelerator, as soon as you touch any pedal the engine kicks back in. So if you hit the brake cos ur going to fast down a hill the engine provides braking while still not using fuel. Obviously if you hit the accelerator the engine kicks back in so you can accelerate. Interestingly in eco pro engine mode the car will allow some gentle braking before the engine cuts back in, on comfort the engine kicks back in as soon as you touch a pedal. In sport the coasting feature and yhe start/stop system in general are disabled.
@@ConquerDriving Out of interest, would you have to turn it off when doing your test if you did your test in your own car. Or is it like other things, if the car is equipped with it as standard its fine, isn't that the case with things like hill hold? I passed a manual test almost 3 years ago so dosnt affect me I just wondered.
For new bmw If car have 48v system When coasting engine will be turned off automatically and more often then 12v only car If car only have 12v system When coasting engine will be idle
There's 1 more variable I think you left out towards the last comparison. Yes, coasting was more efficient than using cruise control, because cruise control applies the brake often, since it aims to keep you at that speed and doesn't let you go over it, whereas coasting will let you go a bit faster. If you compare coasting vs driving normally and not using the cruise control, you might get similar results to coasting because people will normally allow the car to go faster without applying the brakes all the time. Overall, I agree that the benefits of coasting to save fuel economy is not that much to make a difference and definitely not worth losing control of your car.
My cars don't have the ability to apply the brakes during cruise control. If the hill is steep enough they will go over the set speed. Only some very recent cars have the ability to use the brakes during cruise.
I wonder where I would stand with my vehicle, an Audi with S-Tronic gearbox which has intelligent coast. It essentially take the vehicle out of gear when you lift off (and not braking) in order to save fuel.
Great video as always, my only question would be that on that steeper downhill example, the car is using no fuel, I've heard this is because the car's computer will cut fuel and allow gravity/momentum of the car to keep the engine spinning. Is it right? I'm not sure how to check whether my car has this capability or not. It is 15 years old but I do have a current and average MPG trip computer like you used in the video. So will have to give this ago like you did.
if i wanted to downshift a gear and i decide not to but i already pressed the clutch and the car slowed down, how do i get it to not become jittery when i let off the clutch?? (im driving a diesel btw idk if it's different from gas)
I think I've coincidentally noticed Richard do this in one of his videos but I don't remember which, experienced drivers do it without much trouble, it's a matter of experience I'd say but I suppose in this occasion you'd try helping it with the gas pedal to get the rpms higher for the clutch to be easier to lift back again.
Respectfully, this is incorrect. If you were to coast without braking in both instances, at the bottom of a hill you've more potential energy in forward momentum when coasting, as opposed to heat in the engine (or brakes). This is then fuel you don't burn when accelerating or beating wind resistance, that's where you gain your MPG. Granted, this efficiency of driving is hard to achieve whilst using British roads in a safe and considerate fashion. I'm sure you know this, because this is what makes regenerative breaking useful.
Crazy interesting!! So that means that when you're in gear and the engine alone is enough to slow you down, the car's computer somehow knows that it's useless to even inject fuel, and just keeps the whole thing running without any combustion anywhere?
if im in any gear and not holding gas on flat road and get to minimum speed (nad minimum revs) is there any chance for it being unhealthy for a car? i get told in some cars being on 1500 rpm or less in any higher gear is not good for car in some way and does the same apply if youre driving uphill?
You don't want to lug your car as in being slow in 5th gear but accelerating slowly even with your foot planted as it puts stress on the engine, low revs are fine for motorway driving being below 1500 revs just means that if your car needs extra power it won't have it and might cut out
The key is to listen to the car. If it's struggling then you need higher revs. Very old cars didn't like low revs in general but cars built in the last 20ish years are designed to work at low revs. Even automatic gearboxes change very early.
Surely he means to say 20.1 miles per gallon NOT 201 miles per gallon or whatever. Confusing that the UK even uses miles or gallons in an otherwise metric country. Here in Canada we go with Litres/per 100 Kilometers for instance 20 mpg is 14.1 L/km not that good actually.
In this situation, he does mean 200 mpg since the car is going downhill and doesn't have to do any work maintaining that speed or accelerating so it will get extremely high fuel economy since you are just free wheeling down a hill with the engine idling at 800rpm or so.
Daft thing in the UK is we buy fuel by the litre. So I can get around 250 miles to 25 litres(roughly half a tank. His figures are correct because he's not using any fuel whilst coasting. I can't really do the first bit as its too hilly where I live so I stay in gear going downhill. I drive the same car too.
@@antonycharnock2993 Ah the UK. A land with all kinds of units of measurement, crappy weather (well, weather is crazy where I live as well) and people driving on the "wrong" side of the road. But the humour is good and the countryside is beautiful.
What about coasting on an automatic on long stretches of slight downhill slopes that maintains speed when on N but the car brakes when on D? (I am talking about an old school planetary automatic transmission with smooth transition using rev matching when going back to D)
I have question: If you go downhills with some gear and breaking by engine, boardcomputer shows "---"but from the exhaust goes the burnt petrol (or diesel), you can see, hear and feel it from the cars front of you. And, if this would be truth, you would not be able to start the car by pulling in case of drained battery. So, how it is possible? You surely don't go on gravity. Because otherwise you would feel the start of engine, similar to Stop/Start function. So, even in engine breaking, you have some fuel consumption and it is the same situation as if you stay with engine on. Usually, engine takes 1 liter per hour on idle speed. In math: if you stay, you cannot divide by zero, so 1/0 makes mathematically no sense. Analogically, if you travel 100km/h downhills, you have real consumption 1/100=0,01l. But for marketing reason is nicer to write "---". Or I am wrong?
When you're off the gas, the engine's ECU (computer) cuts fuel and the revs start to fall. When the revs reach idle speed, then the fuel is reintroduced to prevent the revs going too low or stalling.
Coasting is dangerous as hell, only know fully as a PDi PT3 ( Well a given up PT3 ).... I coasted for years and found out only last year coasting isn't fuel economical !!!!!! Only took me 25/27 years find that out
It's can be less safe in some situations but just as safe in other. It can also be more fuel efficient or leas. It all comes down to the set of circumstances.
Hi Richard Hope you are having a great evening 🌆 Thank you very much for all your informative videos including this one... 😊 I have two questions though.. Q1: I have also noticed the instantaneous fuel economy go up while coasting in my Honda City.. But, as far as bike is concerned, does the same rules apply?? It's slightly old so doesn't have many details in the instrument cluster.. Q2: I have observed that a lot people here in India refueling till it's almost about to fall off the tank 😂 while calculating the fuel economy... But I only fill it to the first auto cut. So, do you think there will be a major disadvantage when refueling to the brim and also result in inaccurate readings/calculations done by the system while displaying economy in the instrument cluster? Please let me know when you get some time and a video in case you feel would be useful to educate your viewers 😀
A motorbike will be similar but it's very important to put safety first. Briming the tank makes no difference to the fuel economy trip computer as it doesn't work it out by what's in the tank but by how much fuel flows into the engine.
On the contrary, when coasting you cause minimal wear as nothing is under load. Although if you were to coast everytime you slowed down with the brakes, you would likely to wear your brakes more quickly.
@@ConquerDriving Ohh, okay that makes sense I may as well stick to the way you drive then, you make seem so easy which is how I like things to be as I have Autism.
220 miles to the gallon? Was that a mistake? I drive a 1.0 Peugeot 107 and currently sitting on 3 bars after a full tank and have got about 215 miles on the clock from it. As the bars go down the less time it takes for one to disappear which means I will need to fill up soon. I am new to driving so does this sound like I am not driving economically enough? I always get in to the highest gear possible for the situation/speed limit etc and use engine breaking as much as possible. The tank capacity is 35 litres.
interesting clip, how do you deal with a really steep hill in a 30 zone? as i tend to keep it in 2nd gear but it goes down quite fast going over and i have to break qutie a bit to keep it below. What am i doing wrong?
If the clutch is down then the gear won't help. If the clutch is up and it's still accelerating to a high speed then that's a very steep hill, stay slow and use the brake. Low speeds also prevent the brakes from overheating.
Depends on the car. In my Leon I will usually coast below about 7mph. But I don't coast above 10mph very often. If I'm stopping I may coast from a higher speed to prevent the need to go down a gear, but on hills I will generally go down the gears.
That's correct, that's why down the hill the car was using zero fuel when I was off the gas and it uses zero fuel when you're slowing down until the revs get very low. This video was more about maintaining a speed downhill as opposed to slowing down.
Coasting in neutral does not save fuel when: *Actively slowing down *Downhill slope excessive to maintain safe speed without speed control measure. Coasting in neutral saves fuel when: *slowing down early without brakes *able to maintain safe speed traveling downhill that would otherwise require engine power in gear Coasting in neutral saves fuel by allowing the engine to operate at idle speed, which has less resistance than all higher engine speeds. Imagine you're going down a hill at 60 mph, and you can shift to neutral and maintain 60 mph. Your engine would be at about 750 rpm or so, and at around 0.25 gallons per hour (60m/h / 0.25g/h = 240mpg). Now imagine you shift to 5th gear and now you're at 2400 rpm, and you set the cruise control to 60 mph going down the same hill. The engine will burn enough fuel to overcome its own resistance, which would be close to 0.80 gallons per hour, and you'd be getting 75 mpg instead. We established that you can coast down this hill in neutral, which means the wheel horsepower required to maintain speed is 0. When the engine is spinning at 2400 rpm while in gear, there is a resistive force that would cause the car to slow down, and in order to maintain speed, you'd need to use fuel to overcome this resistive force, enough in fact to acheive 0 net wheel horsepower. Essentially, by staying in gear while maintaining a speed you could otherwise maintain while in neutral, you are simply revving the engine for no reason. If this scenario happened perfectly where you were pushing the gas just enough to maintain speed when you could be in neutral and still maintain speed, you could push in the clutch and nothing would happen, no change in engine or wheel speed. However, idling the engine while in neutral does use some fuel, and engine braking uses no fuel at all. Therefore, if you must slow down actively or maintain a safe speed traveling down a steep hill, it is more fuel efficient to be in gear and take advantage of deceleration fuel cut off and use the net braking effect to save both fuel and wear on the braking system.
Every car is different and some more difficult than others. There is quite a delay so press the gas a little bit and wait, if the revs don't rise enough press a little bit more and wait again.
This test is invalid. When you are coasting in gear your car is slowing down more than coasting out of gear. You have to maintain the same average speed in both tests or your test is meaningless.
Coasting doesn’t save fuel because ENGINE IS IDLING This is also VERY dangerous because if the engine stalls all powersteering will be lost Rolling in gear cuts fuel injection & sends the fuel back to the tank. Don’t listen to this clown. Keep it in gear while not using the accelerator, it’s safer & better for your wallet.
I think I was quite objective in the video and I explain the pros and cons of both. Many people comment on this channel saying they coast to save fuel. The point in the video is to show when coasting will actually save fuel and when it will cost fuel. I also explain the dangers. Given your comment I guess you didn't watch the video fully.
The trip computer has no idea how much fuel is being used it's just an estimate. The manual even tells you so. If you want to know if coasting says you money then you have to actually drain the fuel each time or put a set amount of fuel in so you know 100% without any doubt what what because you have no idea if that computer is lying to you if it's accurate you just don't know until your whole video is basically garbage. I don't mean to be a shell but it's the truth and the truth is your car doesn't really have any idea about it's fuel usage and so you don't either. If you're going to make a video make one accurately measure the fuel control the variables do it properly..
I was always taught that you should NOT coast in a manual transmission car. Does it not say in the highway code, Do not coast . I find it very strange that you are teaching learner drivers to do this.
The international space station has been coasting for years and doesn't use much petrol at all so it must work.
I hear that it may be coming down in the next couple of years if vital maintenance isn't carried out.
@@ConquerDriving That's right, it was designed to last for 15 years and has done 21 years so far. NASA said it should last until 2030, however it is showing its age. Still, it's done well.
@@teaandmedals ua-cam.com/video/wHKJntXF5do/v-deo.html&ab_channel=RealEngineering
Haha very funny
Passed my driving test yesterday with 0 minors. Yes 0!!!!! Thank you so much for all your videos of which I watched all. Helped me so much. Thank you
That's great to hear, what an achievement! Congratulations on passing!
Congrats.. lets street racing
I learned driving by watching this channel. I cleared all my doubt. Then my driving was perfect. My driving teacher said you improve so fast. Thanku so much for the videos ❤️❤️❤️❤️❤️❤️
That's great to hear, thank you for watching!
Engineering Explained did a really good video on this as well, definitely worth checking out if anyone wants a slightly more technical breakdown of what's happening in both cases. This was a good video nonetheless :)
No he didn't because the trip computer doesn't really have any idea how much is saved or what is going on it's all estimated. If you want an accurate picture of what was going on then he would have measured the fuel each time. It's actually a total fail
@@elixier33 I said he did a good video explaining what's happening, not on exactly how much fuel he's saved. The trip computers have access to the injector pulse durations (and thus fuel quantities since this will be characterised during manufacturing), deviations, aging information, etc. As a result the trip computer will have plenty enough information to give an accurate enough estimation of instantaneous fuel economy. This is what he used to illustrate that a car rolling in gear down a hill is using less fuel than the same car rolling down the same hill in neutral. It shouldn't take much for someone to extrapolate from that that he'd be using less fuel long term by not coasting.
You're correct though that to quantify the exact volume of fuel saved, he'd have to do a tank fill-up comparison; however, that's not what he was doing, nor is it necessary to illustrate the point, as I explained above.
So No coasting ?
I know coasting is necessary at very low speeds but I personally would rather sacrifice a bit of mpg for more control of the car. Great channel and Videos btw 😀.
This reminds me of your lockdown challenge! (and you smashed your target!) Both amazing videos. :)
Thanks for watching and commenting on so many videos, I recognise your name now.
I'm pretty new to this channel, what is the name of that lockdown challange video?
@@ksrele it was this vid: ''How to drive economically - Save money on fuel!''
(Rich set a challenge to get 56mpg during a drive, when it was during lockdown) :)
Passed my driving test thanks to your vids!
Much love from your mate down under
Failed my first driving test but i literally watched all your videos up until my test yesterday and i passed with only one minor!! 💪💪
That's great to hear, congratulations on passing!
I regularly do a route across mid Wales, about 100 miles. Tried several times to coast down the long down hills in neutral - when it was safe. Fuel consumption was always worse than if I drove normally, modern engines detect load and acceleration and hold back on fuel delivery more than if your car is just at idle.
I use a mixed approach. If clutch-coasting serves my purpose better, I do that. If engine-braking serves my purpose better, I do that. I only use the brakes when necessary, and almost never ride my brakes.
Thank you for making this video! As a hypermiler, I coast all the time and it works for me. People seem to think that coasting always uses more fuel since the engine is idling instead of in decel fuel cutoff, but they ignore the fact that engine braking also slows the car down just like riding the brakes does which isn't usually wanted when hypermiling. Coasting a long distance getting several hundred MPG can add more to your average than engine braking for a short distance using no fuel. But of course stay in gear and take advantage of decel fuel cutoff if you need to slow down or not pick up too much speed, no reason to coast if you are going to be braking. When people say I'm wrong and don't believe my test results, now I have an excellent video to point them to :)
You are correct. Coasting can definitely save fuel in the correct set of circumstances, but not all circumstance. Many people feel coasting is dangerous which is another reason some may not like it. But if you know what you're doing it can actually be a more economical way to drive and just as safe.
Which video are you referring to?
@@hydrocarbon2195 This one
Exactly, I'm a newbie but I refuse to believe that putting the car off gear doesn't lead to fuel economy, it's just one of those common sense things. And they keep saying this all in the name of safety. Speed is what's dangerous, not coasting. Although, I don't know about new cars with electronics, for those it might be a thing, but not for older cars.
@@Oxymorone7 Yup. Coasting can definitely save fuel in some circumstances, but not all. Unless coasting is causing someone to pick up too much speed and brake a lot, which isn't when coasting would be beneficial anyways, I don't see any safety hazard. People say the driver loses control when coasting because they won't be able to accelerate immediately, but being in a high gear isn't going to be much better. Realistically, if fast acceleration is needed, downshifting will usually be necessary. Shifting from, for example, 6th gear to 3rd gear for maximum acceleration isn't going to be any faster than shifting back into gear from neutral. But with automatic transmissions, especially ones with a significant delay going back into gear, that could certainly be a valid argument.
We used to do this type of run, when poor, trying to coast to the petrol station :)
Explained very well. Engine compression braking certainly works a lot better with modern injection units being able to completely shut off. It's rare to hear exhaust popping from unburnt fuel when cars pass you downhill these days. This is the main reason why I favour braking in one gear until I reach idle, or selecting a gear just before needing to apply the gas.
One small correction you may be interested in. The compression doesn't actually cause the engine braking as it's equalled out by the expansion of another piston. It's actually the vacuum created from piston to closed throttle body that causes the majority of the braking. It's technically vacuum braking. I used to believe it was compression also until I found out otherwise.
@@ConquerDriving Yes, you are correct and I'm fully aware of this. I use the term very loosely without opening a can of worms and getting into a full dissertation on the subject🤣. I refer to this method alot when explaining old school braking through the gears. Back in the days with carburettor cars, as they naturally had an overrun and therefore require the induction to be almost cut off. Although still true with modern cars, they also have the ability of a "no power stroke" to cancel the compression stroke. Due to the fact the fuel is cut off. Hence, no reason to brake through all the gears. Plus, it all gets messy when we start to consider kadence effect, inertial/angular momentum and so on. Also, older diesel engines didn't have a throttle body, so it was simply managed through the fuel starvation and stoichiometric ratio. Since the introduction of Egr regulation systems, turbos etc, this has all now changed. Another argument that pops up alot is, why don't diesels have good engine braking considering the compression ratio is higher than petrol cars? Consequently, the "vacuum princible" does explain this well.
I live in the US so I usually only coast in neutral coming off freeway or highway exits, and sometimes when I know I'm coming up to a full stop like a stop sign or long red light for example. It's extremely flat in the state I live but even for other US drivers I think this is helpful because many of them will throw it in neutral on almost any decline and could end up being dangerous.
I'm surprised you actually drive a manual as many many many people in North America don't! Automatic gearing is the norm over there where in the UK, manual gear shifting is the norm, we actually have different driving tests for it. If you pass the Auto test you can only drive Automatic cars where if you pass the Manual test, you can drive both types. Its another reason why when hiring an Auto in the UK costs slightly more as there is much much less of a demand to use one (Cheaper to hire a Manual).
@@CrazyInWeston It's true, manual driving is a rare skill in the US. Automatics are the norm, and there is only a very limited selection of car models available with a manual transmission option. I had always wanted to learn to drive stick, because it looks fun. So, I actually bought a brand new car a couple years ago, a 2020 Toyota Corolla hatchback. The dealership had to deliver it to my house after I wrote the check, because I couldn't drive it. I taught myself to drive the car by watching UA-cam videos, especially those on this channel. There are no driving schools in my city that teach manual, so I was on my own. I don't know if any states have special tests or licenses for manual driving. I live in Ohio, and there is no special test here based on the transmission of the car. After buying the Corolla, all I needed to do was register the car and buy plates. I did not need to take a test or get a new designation on my driver's license. By the way, I kept my automatic car, so it's nice having both an automatic and a manual. I'm 37 years old, female, by the way.
I feel like teaching learners to drive economically would actually benefit them a lot, especially financial. Like I have a 1.4 TDI VW Polo. If I do my route to work and I make an effort to be efficient. I can achieve 90-100 mpg over a 14 mile trip. Meaning the whole journey uses under a litre of fuel. If you drive carefully all the time. The savings really so add up , especially in the current fuel situation. But admittedly, not everyone has the patience or time to hypermile consistently
The 3 cylinder 1.4 TDI you have is renowned for how economical it can be.
@@ConquerDriving exactly why I bought it, I went from North Wales to Manchester today. 92.5 mpg. Incredible really. I’ve had it 6 months and it’s been solid
I've been trying this with my automatic over the last two weeks. Using my bmw's mpg gauge - I saved 2-3mpg more but my attention was no longer on the road so I am stopping this test.
Just go easy on the throttle & I'll be OK. Coasting is only justified when you are just about to run out of fuel !
Best advice even it works in Indian roads
8:40 You only went there for the meme did you 😂 Anyway, thanks for your videos, as someone who's had a driving licence (but not much experience) for a while now but only recently moved to the UK they're super helpful for me. Greetings from a fellow MX-5 driver!
😂 It is about 5 mins from me so I drove there a lot. You obviously have a good taste in cars.
The problem with coasting is when a road situation suddenly changes, so that you have to IMMEDIETALY speed up, then if you're slow with gear changing, I wouldn't suggest using it at all and when experienced I'd suggest doing it only in places, which you know well.
I think he addressed that in the last few minutes, in that for a lot of small cars, the gear they're engine braking in has poor torque anyways, and have to change gears to get enough power to get anywhere fast. In that case, the difference between 5 -> 3 and N -> 3 is not that big.
The times I've needed to immediately speed up (1: accidentally pulled out in front of a tractor, 2: van driver doing 19 mph down the M4 finally pulled onto the hard shoulder) had no use for coasting.
Bilt Hamber toucheless snow foam and spray off Karcher or other in 5. Nice new white MX5 Richard !!!! Just drive at 12-18 mph on wet roads to filming location to stop the new dirt spray!!!
Bilt Hamber do make good products.
Bilt Hamber do make good products.
@@ConquerDriving I love em. Got into detailing last 6 months.
For me (I'm from Serbia) is much logical to measure fuel consumption in l/100km so lower number is better, and my car (VW Tiguan) can measure consumption even when is stationary, the unit is l/h then. And when I left car in gear and let off the gas pedal it is showing me 0 l/100km.
One more thing: coasting with car in neutral is not safe for breaking. If you lose your breaks for any reason (break fluid leek for example) if car is in gear engine will help you break, but if car is in neutral it will be very hard to put it in gear again if the car starts to speed up on downhill.
Very true. I did warn people in the video.
Wouldn't this only apply if you lose brakes and have a open strech of road for you to slow down using engine braking? Probability of hitting that conditions is pretty low as:
1) There mostly always is traffic on the road.
2) Other drivers almost always assume you have breaking and base there driving decisions on that.
The only difference between the two is that when coasting in neural and you lose breaking, you should have the ability (or smarts/quick thinking) to select the right gear and then keep downshifting if immediately required.
Am I missing something here?
Love your videos 😍Keep it up!
Thanks... I coast ALOT... For all tje above reasons and was honestly curious to know the truth... Now i know ive been doing it correctly all along 👌
can you please film yourself in different driving situations, in city traffic, in fast bends, parking and commentate what you are thinking and some tips in those situations would be good too! thanks richard!
Thank you for your suggestion, I may do in the future.
In my experience, not very often or very much is my answer.
I was told when you start a manual car to never give it gas while clutch is down. Always find the bite point first and give it gas as you slowly let go of the clutch.
@@benji3845 What do you mean? You'll ruin your clutch doing it the way he shows.
This video may help: ua-cam.com/video/UdTSRBJrw7Y/v-deo.html
One parameter that you totally forgot was hybrid vehicles. When coasting or motor breaking (regenerative braking), both cases alike, I don't even use the ICE, hence no fuel being used.
This series is for young/new drivers who typically have an inexpensive petrol vehicle with a standard gearbox. No new driver is buying an EV/hybrid as a first car with their own money.
@N1withaskillet Why not? Hybrid is getting mainstream. There are lots of cheap Toyota Hybrids out there. About EV:s, sure, the really low-end market is several years away, but used, long-mile low-price hybrids are everywhere.
I coasting because its makes sense to use the decline of the road to move you there
I think if you need to use the accelerator to go down a hill you could roll down for free you are wasting fuel. If you roll down the hill too fast, then put it in the lowest gear you don't have to use the accelerator to go the speed you want.
neutral while idle take around 0,7Liter/1hour 750rpm cca . So if we move 50kmh in neutral our fuel consumption is around 1,8Liter/100 km (when you coastin and NOT idling it take your engine to like 1000 rpm) . so 1,8liter / 100 km in € is around 2,88€ per 100 km . You know who is driving 2,80€ per 100km ? , electric cars . So when u r coasting u basicly have electric car fuel consumption . BUT! cheaper is not coasting , but left gear there and u might safe around 15-30% .Imagine yearly gas will cost you not 1000€ but 700€ .
Wish you did more videos for automatic cars. And how to save on petrol etc. 😔
This video is about Eco driving, same applies to automatics: ua-cam.com/video/PLJqkYfIgtM/v-deo.html
Very good channel for learners
What about traction? The wheels are disconnected from the engine and there is no drive going through them. It must be unsafe to corner at speed while coasting.
Good break down all things considered! I tend to debate about this one in the comment sections too 😅
Coasting makes no difference to traction. It takes away engine braking and your ability to accelerate. I hope you're OK. What part of Ukraine are you in?
@@ConquerDriving I'm in Kyiv, I am safe. Thank you for your concern. I study at university online, go to the grocery store, look for a job, so it is fairly normal now. Air raid sirens go off much more rarely than they used to in the first four weeks. Many have suffered and keep suffering much more than me. I hope the ones responsible will be held accountable for their heinous actions. Britain helps us a lot. Boris Johnson visited Kyiv recently, so it will all be alright :)
@@ConquerDriving I thought it made a difference in traction, but not physical though. As in obviously tyre traction is the same, but wheels are disconnected from each other. Anyway the point of the video was fuel economy, but I don't think I'll be using coasting in this manner. Also, an area where people lose fuel to coasting is when they approach traffic lights for example, or junction where they know the will stop for some time. They put it in neutral and coast. In gear the car would be using no fuel and would reduce brake wear. But you've talked about it loads.
I'm glad to hear you're OK and things are getting better. I'm hoping the fighting will stop soon.
As for loss of traction from the wheels being disconnected, I've never noticed a difference. I personally don't coast at speed but it can be more fuel efficient. I do use neutral a lot in traffic though as it save my leg and my clutch. But only at low speeds where engine braking would be happening anyway.
Best driving teacher as of now
So what if the car stops while youre in neutral and moving? Dont you lose control? Dangerous? Ive always told people to never use neutral when youre driving down a hill if engine will stop you are out of control.
It seems like worst practice when talking about safety at the road.
Edit: Ah you mention this at the end. 👍👍👍
After watching this at least I came to the conclusion that a momentary fuel consumption of 0.0l/100km shown while coasting is a sweat little lie, since that means an idle engine would have to reach way over 5000 mpg to honestly round down to zero.
I wonder why the UK uses L for fule and pounds per L for fule price, but mph for speed and mpg for fule economy. Is it annoying to convert between them when determining pounds per mile in terms of cost of divining?
Thanks for your time and wonderful videos as a learner I some times don’t know which line I should use especially in new places that there isn’t any mark in the road . Can you please make a video ? thanks
Thank you. Unfortunately sometimes it's impossible to know which lane you should use. But I may do a video on it in the future to help. This video may help though: ua-cam.com/video/4OdZYIoq9po/v-deo.html
Coasting saves a lot fuel when you drive at low speed, bellow 15 mph. At this speed, your engine is spinning a lot faster than the wheels because of low gears, and engine braking on second/first gear is too strong to be beneficial, and coasting will be a lot better for your mileage, if you drive at low speed often
Ive passed my theory last week (45/50 and 58/75) after failing twice. However, i have no plans to do drivig lessons for a while (for at least four months or even years) as its so expensive (at least £27-40/per hour) to learn and drive. I also dont want to drive in a car withoput dual controls. I might even do my theory again cause i didnt knwo it expires after 23 months (just under two year).
Learning to drive is expensive, the more practise you can get with a supervisor the cheaper it is. It's very sensible not to start in a car that doesn't have dual controls.
Do you have a relative or friend who could help you get started in an empty parking lot? That's pretty much our only choice here in the U.S. (If you can find a manual driving school, the lessons are $100 an hour).
I always use coasting going downhill. Surely not stepping on the accelerator should save gas
Does the car have to burn extra fuel to cancel the force slowing down the car by releasing the pedal that wouldn't have been burned if you were in neutral? That's why I thought if you were driving in a lower gear the engine is just "fighting" itself using extra fuel to cancel an engine resistance force I don't need. I suppose opening the throttle would move some of the losses out the way.
If you have to slow at the bottom of hills (or keep braking to maintain a safe speed) it's worth just staying in gear to remove the idling losses unless you turn off the engine when going in neutral, which will make the brakes less effective after a few uses. I did have a Citroen C2 that didn't engage DFCO until over 2000 rpm so sometimes I'd alternate between a low gear and coasting. Coming down the hill to Llanfihangel Nant Melan is a good example because it's a long hill with a 40 at the bottom, so unless you're going to blow through the 40 like a sinner, you are better off staying in gear and it only scrubs a bit of speed off the descent and you're still over the speed limit at the bottom.
Also the hills going down into town from Bath university. You'll get to 40 on a bicycle in a 30 on the least steep hill (the others I chickened out and used the brake due to not trusting traffic conditions). So I imagine a car could get rolling to 100+ if you could keep it on the road round the corners and you didn't cause an accident. Also there is a roundabout at the bottom. So that is another hill you'd probably stay in 2nd or 3rd, though electric car owners will get a decent bit of charge back in the battery descending the 150 metres of elevation.
I had a ford focus and when I stopped moving it would go from miles per gallon to gallon per hour
Some countries it is not legal to coast as described in this video.
Last time I checked the HC , coasting was illegal in the UK??
My bmw 2 series turns the engine off when coasting, it does it automatically when you lift off the accelerator, as soon as you touch any pedal the engine kicks back in. So if you hit the brake cos ur going to fast down a hill the engine provides braking while still not using fuel. Obviously if you hit the accelerator the engine kicks back in so you can accelerate. Interestingly in eco pro engine mode the car will allow some gentle braking before the engine cuts back in, on comfort the engine kicks back in as soon as you touch a pedal. In sport the coasting feature and yhe start/stop system in general are disabled.
Many manufacturers are including coasting in their automatic setups now. Kia even do it in some of their manuals.
@@ConquerDriving Out of interest, would you have to turn it off when doing your test if you did your test in your own car. Or is it like other things, if the car is equipped with it as standard its fine, isn't that the case with things like hill hold? I passed a manual test almost 3 years ago so dosnt affect me I just wondered.
For new bmw
If car have 48v system
When coasting engine will be turned off automatically and more often then 12v only car
If car only have 12v system
When coasting engine will be idle
@@leonpano doesn't really matter what the engine is doing the effect is the same, drive is cut off too the wheels. Interesting though.
There's 1 more variable I think you left out towards the last comparison. Yes, coasting was more efficient than using cruise control, because cruise control applies the brake often, since it aims to keep you at that speed and doesn't let you go over it, whereas coasting will let you go a bit faster. If you compare coasting vs driving normally and not using the cruise control, you might get similar results to coasting because people will normally allow the car to go faster without applying the brakes all the time. Overall, I agree that the benefits of coasting to save fuel economy is not that much to make a difference and definitely not worth losing control of your car.
My cars don't have the ability to apply the brakes during cruise control. If the hill is steep enough they will go over the set speed. Only some very recent cars have the ability to use the brakes during cruise.
@@ConquerDriving Oh, good to know. I don't think I've been in a car like that here in the US.
All the cars I've been in outside those with radar cruise control, just apply engine braking when over the speed, not actual brakes.
I wonder where I would stand with my vehicle, an Audi with S-Tronic gearbox which has intelligent coast. It essentially take the vehicle out of gear when you lift off (and not braking) in order to save fuel.
Many cars are doing this now, it's nothing to worry about and safe.
The simple rule is the less you use your brake the more mpg you will get.
Great video as always, my only question would be that on that steeper downhill example, the car is using no fuel, I've heard this is because the car's computer will cut fuel and allow gravity/momentum of the car to keep the engine spinning. Is it right?
I'm not sure how to check whether my car has this capability or not. It is 15 years old but I do have a current and average MPG trip computer like you used in the video. So will have to give this ago like you did.
Carburated cars don't do this but most fuel injected cars do this. 15 years was 2007, i know many older cars than that that do that
Thank you, most cars since the 1990s have fuel cut when you're off the gas.
if i wanted to downshift a gear and i decide not to but i already pressed the clutch and the car slowed down, how do i get it to not become jittery when i let off the clutch?? (im driving a diesel btw idk if it's different from gas)
Switch to the proper gear. Likely one lower than the one you initially selected.
I think I've coincidentally noticed Richard do this in one of his videos but I don't remember which, experienced drivers do it without much trouble, it's a matter of experience I'd say but I suppose in this occasion you'd try helping it with the gas pedal to get the rpms higher for the clutch to be easier to lift back again.
Hold the clutch at the bite point for a few seconds before coming off it and it will be smooth.
@@ConquerDriving thanks for the help
Respectfully, this is incorrect. If you were to coast without braking in both instances, at the bottom of a hill you've more potential energy in forward momentum when coasting, as opposed to heat in the engine (or brakes). This is then fuel you don't burn when accelerating or beating wind resistance, that's where you gain your MPG.
Granted, this efficiency of driving is hard to achieve whilst using British roads in a safe and considerate fashion. I'm sure you know this, because this is what makes regenerative breaking useful.
Crazy interesting!! So that means that when you're in gear and the engine alone is enough to slow you down, the car's computer somehow knows that it's useless to even inject fuel, and just keeps the whole thing running without any combustion anywhere?
Yes, the computer is very clever and is doing many things many times a second.
Is coasting harmful for the engine or it's normale while running
Coasting does not harm the engine.
if im in any gear and not holding gas on flat road and get to minimum speed (nad minimum revs) is there any chance for it being unhealthy for a car? i get told in some cars being on 1500 rpm or less in any higher gear is not good for car in some way and does the same apply if youre driving uphill?
You don't want to lug your car as in being slow in 5th gear but accelerating slowly even with your foot planted as it puts stress on the engine, low revs are fine for motorway driving being below 1500 revs just means that if your car needs extra power it won't have it and might cut out
The key is to listen to the car. If it's struggling then you need higher revs. Very old cars didn't like low revs in general but cars built in the last 20ish years are designed to work at low revs. Even automatic gearboxes change very early.
Surely he means to say 20.1 miles per gallon NOT 201 miles per gallon or whatever.
Confusing that the UK even uses miles or gallons in an otherwise metric country.
Here in Canada we go with Litres/per 100 Kilometers for instance 20 mpg is 14.1 L/km not that good actually.
In this situation, he does mean 200 mpg since the car is going downhill and doesn't have to do any work maintaining that speed or accelerating so it will get extremely high fuel economy since you are just free wheeling down a hill with the engine idling at 800rpm or so.
Daft thing in the UK is we buy fuel by the litre. So I can get around 250 miles to 25 litres(roughly half a tank. His figures are correct because he's not using any fuel whilst coasting. I can't really do the first bit as its too hilly where I live so I stay in gear going downhill. I drive the same car too.
@@antonycharnock2993 Ah the UK. A land with all kinds of units of measurement, crappy weather (well, weather is crazy where I live as well) and people driving on the "wrong" side of the road. But the humour is good and the countryside is beautiful.
What about coasting on an automatic on long stretches of slight downhill slopes that maintains speed when on N but the car brakes when on D?
(I am talking about an old school planetary automatic transmission with smooth transition using rev matching when going back to D)
It's possible it may save fuel in some circumstances but I don't recommend it as you will have less control.
I have question: If you go downhills with some gear and breaking by engine, boardcomputer shows "---"but from the exhaust goes the burnt petrol (or diesel), you can see, hear and feel it from the cars front of you. And, if this would be truth, you would not be able to start the car by pulling in case of drained battery.
So, how it is possible? You surely don't go on gravity. Because otherwise you would feel the start of engine, similar to Stop/Start function. So, even in engine breaking, you have some fuel consumption and it is the same situation as if you stay with engine on. Usually, engine takes 1 liter per hour on idle speed. In math: if you stay, you cannot divide by zero, so 1/0 makes mathematically no sense. Analogically, if you travel 100km/h downhills, you have real consumption 1/100=0,01l. But for marketing reason is nicer to write "---". Or I am wrong?
When you're off the gas, the engine's ECU (computer) cuts fuel and the revs start to fall. When the revs reach idle speed, then the fuel is reintroduced to prevent the revs going too low or stalling.
Coasting is dangerous as hell, only know fully as a PDi PT3 ( Well a given up PT3 ).... I coasted for years and found out only last year coasting isn't fuel economical !!!!!! Only took me 25/27 years find that out
It's can be less safe in some situations but just as safe in other. It can also be more fuel efficient or leas. It all comes down to the set of circumstances.
Hi Richard
Hope you are having a great evening 🌆
Thank you very much for all your informative videos including this one... 😊
I have two questions though..
Q1: I have also noticed the instantaneous fuel economy go up while coasting in my Honda City.. But, as far as bike is concerned, does the same rules apply?? It's slightly old so doesn't have many details in the instrument cluster..
Q2: I have observed that a lot people here in India refueling till it's almost about to fall off the tank 😂 while calculating the fuel economy... But I only fill it to the first auto cut. So, do you think there will be a major disadvantage when refueling to the brim and also result in inaccurate readings/calculations done by the system while displaying economy in the instrument cluster?
Please let me know when you get some time and a video in case you feel would be useful to educate your viewers 😀
A motorbike will be similar but it's very important to put safety first. Briming the tank makes no difference to the fuel economy trip computer as it doesn't work it out by what's in the tank but by how much fuel flows into the engine.
@@ConquerDriving thank you for your response 👍🏻
Will this work the same way with a carburetor car as well, or will it have a different effect since its not fuel injected ?
I've never had a car that did 100 miles to the gallon, but I noticed 32.5mpg please explain thank you
That was not an average mpg over the journey. Only the instant mpg for that moment in time down a hill.
❤️
How do you properly brake when someone's right behind you?
Gently. Try to slow down more early for dangers to further reduce your risk of braking harshly.
5:33 some switch to fuel/hour when idling stationary, then you still know you're using fuel and how much
I have seen that, it's handy when the car shows that information.
@@ConquerDriving some Audi show liter/hours when standing
Hello I a fan and I Don dive I have a friend who I told your information and he agreed
But Does coasting will burn clutch?
Coasting does not burn the clutch. This video may be of interest: ua-cam.com/video/ttB83nt8J-c/v-deo.html
So does coasting in Neutral wear out the clutch or doesn't wear out anything?
On the contrary, when coasting you cause minimal wear as nothing is under load. Although if you were to coast everytime you slowed down with the brakes, you would likely to wear your brakes more quickly.
@@ConquerDriving Ohh, okay that makes sense I may as well stick to the way you drive then, you make seem so easy which is how I like things to be as I have Autism.
Is it bad to use the clutch and brake at the same time? When reversing i tend to just use the clutch and regulator with the brake
That is bad, it's like a tug of war between the clutch and the brake. It will wear the clutch more quickly and will stall some cars.
220 miles to the gallon? Was that a mistake? I drive a 1.0 Peugeot 107 and currently sitting on 3 bars after a full tank and have got about 215 miles on the clock from it. As the bars go down the less time it takes for one to disappear which means I will need to fill up soon. I am new to driving so does this sound like I am not driving economically enough? I always get in to the highest gear possible for the situation/speed limit etc and use engine breaking as much as possible. The tank capacity is 35 litres.
This is in an ideal situation to compare coasting with engine braking. It's not the average.
yeah dawg
which car is this honda ..? which model hatch back...?
The hatchback in this video is a 2014 SEAT Leon fr 1.4 TSI 140 SC.
Ah yes, if only my car actually had sufficient engine breaking to keep slow lol
interesting clip, how do you deal with a really steep hill in a 30 zone? as i tend to keep it in 2nd gear but it goes down quite fast going over and i have to break qutie a bit to keep it below. What am i doing wrong?
If the clutch is down then the gear won't help. If the clutch is up and it's still accelerating to a high speed then that's a very steep hill, stay slow and use the brake. Low speeds also prevent the brakes from overheating.
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And have been watching your channel from 2021
Your British accent is sounds more like the Punjabi👌🏻
Coasting on a bike is the most efficient
Do you coast at speeds >5-10mph?
Depends on the car. In my Leon I will usually coast below about 7mph. But I don't coast above 10mph very often. If I'm stopping I may coast from a higher speed to prevent the need to go down a gear, but on hills I will generally go down the gears.
@@ConquerDriving it's good you ignore the fuel savings :)
But really, the car doesn't combust during engine breaking? That's stalling the engine.
I definitely do not coast 😜
*Accelerator - not 'gas'. 🤦🏼♂️
I’m sure top gear said clutch down in gear uses no fuel so you get a few hundred metres for free before you brake for the roundabout/corner
That's correct, that's why down the hill the car was using zero fuel when I was off the gas and it uses zero fuel when you're slowing down until the revs get very low. This video was more about maintaining a speed downhill as opposed to slowing down.
Coasting in neutral does not save fuel when:
*Actively slowing down
*Downhill slope excessive to maintain safe speed without speed control measure.
Coasting in neutral saves fuel when:
*slowing down early without brakes
*able to maintain safe speed traveling downhill that would otherwise require engine power in gear
Coasting in neutral saves fuel by allowing the engine to operate at idle speed, which has less resistance than all higher engine speeds. Imagine you're going down a hill at 60 mph, and you can shift to neutral and maintain 60 mph. Your engine would be at about 750 rpm or so, and at around 0.25 gallons per hour (60m/h / 0.25g/h = 240mpg). Now imagine you shift to 5th gear and now you're at 2400 rpm, and you set the cruise control to 60 mph going down the same hill. The engine will burn enough fuel to overcome its own resistance, which would be close to 0.80 gallons per hour, and you'd be getting 75 mpg instead. We established that you can coast down this hill in neutral, which means the wheel horsepower required to maintain speed is 0. When the engine is spinning at 2400 rpm while in gear, there is a resistive force that would cause the car to slow down, and in order to maintain speed, you'd need to use fuel to overcome this resistive force, enough in fact to acheive 0 net wheel horsepower. Essentially, by staying in gear while maintaining a speed you could otherwise maintain while in neutral, you are simply revving the engine for no reason. If this scenario happened perfectly where you were pushing the gas just enough to maintain speed when you could be in neutral and still maintain speed, you could push in the clutch and nothing would happen, no change in engine or wheel speed.
However, idling the engine while in neutral does use some fuel, and engine braking uses no fuel at all. Therefore, if you must slow down actively or maintain a safe speed traveling down a steep hill, it is more fuel efficient to be in gear and take advantage of deceleration fuel cut off and use the net braking effect to save both fuel and wear on the braking system.
All true.
It's not rocket science. You use fuel when coasting whereas rolling in gear with a closed throttle will use zero fuel at all.
Finally I'm here
Is there some sort of tip on how hard to press the gas pedal to get to 1500 revs without going over 2000? I always seem to go over 2000.
Every car is different and some more difficult than others. There is quite a delay so press the gas a little bit and wait, if the revs don't rise enough press a little bit more and wait again.
@@ConquerDriving Thank you, I will have to train on it.
Sit further away from the pedals or wear lighter shoes.
@@clover7359 Further away? Not closer? My shoes are pretty light since I use them for running doubt that's the issue.
@@Yrbanmaten Yo can you control the revs better now?
bro ur so cute i wish u were my instructor
Coasting is not environment friendly. It creates more pollution than driving at a constant speed.
As the video states, it depends on the situation.
Hello 👋 im in Colchester and i need lessons can you book me whenever you can thanks 🙏
Hello, I'm very busy at the moment. The best way to try and get a lesson is to complete the online booking form on the website.
This test is invalid. When you are coasting in gear your car is slowing down more than coasting out of gear. You have to maintain the same average speed in both tests or your test is meaningless.
Where is the MX5 drift video?
Coasting doesn’t save fuel because ENGINE IS IDLING
This is also VERY dangerous because if the engine stalls all powersteering will be lost
Rolling in gear cuts fuel injection & sends the fuel back to the tank.
Don’t listen to this clown. Keep it in gear while not using the accelerator, it’s safer
& better for your wallet.
I think I was quite objective in the video and I explain the pros and cons of both. Many people comment on this channel saying they coast to save fuel. The point in the video is to show when coasting will actually save fuel and when it will cost fuel. I also explain the dangers. Given your comment I guess you didn't watch the video fully.
The trip computer has no idea how much fuel is being used it's just an estimate. The manual even tells you so. If you want to know if coasting says you money then you have to actually drain the fuel each time or put a set amount of fuel in so you know 100% without any doubt what what because you have no idea if that computer is lying to you if it's accurate you just don't know until your whole video is basically garbage. I don't mean to be a shell but it's the truth and the truth is your car doesn't really have any idea about it's fuel usage and so you don't either. If you're going to make a video make one accurately measure the fuel control the variables do it properly..
I was always taught that you should NOT coast in a manual transmission car.
Does it not say in the highway code,
Do not coast .
I find it very strange that you are teaching learner drivers to do this.
this isnt for learner drivers clearly. its just a video
he literally gives a warning at the end about it, he's not teaching learners to do this
I'm not telling people what to do, I'm experimenting to see if something is true.
Richard, I have tried to contact you via messenger. Please check "others" folder. Przemek (Poland)
Hello Przemek, I have responded to all my messages. At the moment I'm unable to take on any new pupils.
@@ConquerDriving I am not a pupil;) My message is about some other kind of issue;)
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