MPG Test // I Drive 400+ Miles with My New 6.6L Gas Engine L8T on my 2024 GMC Sierra 2500 HD
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- Опубліковано 12 лип 2024
- As I drove home from the dealership, I did an impromptu MPG test with speeds ranging 65-75 mph on interstates and highways. Granted my engine wasn't even broken in yet, but I figured it'd be interesting to see what MPG I get on the new 6.6L L8T gas engine with 10-speed Allison transmission.
00:00 Intro
00:58 Parameters
02:20 Initial Impressions
12:18 Half-way
14:35 Low on Fuel
16:00 Filling Up
16:48 MPG Results
17:21 Conclusion
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#gmc #gmcsierra #besttruck @gmc - Авто та транспорт
Do you have an update on this video now that it’s broken in?
Yes, thank you for asking. Much improved MPG now that it's broken in. Here's the unladen update:
ua-cam.com/video/9ppb9gceeNw/v-deo.html
And, the 1st tow/MPG update:
ua-cam.com/video/wSBg0DW0eFg/v-deo.html
Still less $ than diesel even at 15mpg. Say $1 per gallon less every fillup. 35 gallons or so each time. Also you can buy a lot of gas for $10,000 you saved buying a gas version over diesel. Its a win-win. No D.E.F. No diesel fuel filters every year. $100 oil changes instead of $400-500. All adds up to a big saving. I sold my 2022 Ram 2500 cummins and went to gas too. I like it so much more. Good choice.
Great points. Agreed, I think diesel is more about the towing experience, than economy. Those who argue for diesel being more economical than gas really have a losing argument all the way around. Unless you're a hotshot driver doing 50K+ mi per year while towing I suppose, right? I've been very happy with my gasser so far.
Great comments.
I just worry about the reports of excessive oil consumption with this motor.
@@raythemanroe I think it's like all the over-reported issues on the big 3 whether pistons, heads, valves, etc...limited in reality, but lots of coverage in social media and news. I'll definitely be keeping an eye out though and monitoring mine to be safe.
Also these motors don’t have AFM like the 1500s and they drop lifters every 60k. I think it is a solid choice if you plan to keep it long term. The maintenance is cheaper. Plus the $10k you saved.
Great information and video, thank you!
Thank you!
My gmc 3500 4x4 crew cab long bed. 6.6 gasser has really impressed me. They have got this pickup dialed in for just about everything. Best 32 miles average 19.6 mpg. My average with bed loaded with 3600# has been faithfully 14.3 mpg. Yet to pull my goosneck loads. But so far so good. I have owned ram cummings since 1992. I did pull a bumper pull trailer at dealership they let me pull a chevy 2500 for about 50 miles and it was in higher elevation of colorado. Was impressed with the pulling. So it sold me.
Great insights and data. Thank you
24 3500 high country 6.6L gas, Florida driving 12.3MPG total 8300 miles. I’m pretty solid at 16.7MPG highway at the speed limit. Got 18 once.
When new, change the oil at 500 to 1000 miles. You need to eliminate elevated levels of factory silicon sealants and initial wear metals. After that, 6000 mile or 8 months, whichever comes first. I use Mobil 1 from Walmart and a quality new filter. Almost all the engines you see junked at 100,000 miles followed factory 10,000 mile factory recommended intervals. including Toyotas. Keep you own sticker on your sun visor because a replaced windshield means starting over. Keep extra filters and tools dedicated to this job in a proper oil drain pan so everything is easy close at hand. You can do the job yourself in less time than it takes to drive to crooked auto service where they put in $1 per quart oil that will varnish your engine, and charge you for full synthetic.
Blah, blah, blah.
That’s pretty good man for a big truck, I get 16 and 17 highway and 10 and 11 in town with my half ton 6.2
purchased 23 high country back in April and also bought out of state, Roundtrip from LA to Phoenix in same day (brutal). I averaged around 15-16 mpg......in top gear transmission doesn't matter really
beautiful truck!, wasn't many 24s around when i bought and traded a 23 1500 with same interior as new HD
Thank you!
Don't hesitate on getting the pad of the seat rebuilt, had to add foam, six months in, I'm 200 # 6 foot
Brought a 3500 .Got 32k on it. Love it. Ran diesel for 30 plus years as my rig.Great work truck. Welding rig .
That’s consistent with what I get on the highway unloaded. Just completed a 400 mile round trip yesteray towing 10k pound enclosed trailer and got 8mpg. 3k miles now on my 2024.
Thank you for sharing. That 8mpg seems pretty decent while towing or at least good enough for me.
Made a 1,423 mile round trip in my 2019 2500 Duramax without towing to Colorado and back to California with 3 days running around town and got 19.5. Very happy with the diesel
Wait till you have an out of warranty repair. Just saying.
And?
Great video. I have the 2022 with the 6 speed with 17k miles and average 16-18.5 mpg. I live in GA and don’t tow it often.
bullshit
I average 17 mpg on a 2023 6.6 gaser
Love the videos man. You're a lot more detail oriented than a lot of other guys! I'm curious which dealership you got this from. If you don't mind sharing!
Thank you, appreciate the feedback. Yes, I got mine from Everett GMC in AR. Give one of my two salesman a call:
Brian Cornwell: 501-860-1954
Brandon Sharver: 501-844-7548
I flew in and they picked me up and was back on the road in no time. It was a straightforward and completely honest deal. No bait and switch and no rediculous fees or surprises. Highly recommended.
@@AdventureRocks thanks!
Just over 4500 miles on my 2024 Silverado 2500HD with the 6.6L gasser.
Averaging 17.8 non-towing.
Short trips towing have been 11.2.
I’m satisfied with that.
Agreed, those are great numbers
What were you towing? Thanks
That’s a lot closer to what TFL got
Fuel mileage gets better around 10K miles. I was getting 18 highway with my 22 silverado before I sold it. Worst decision was selling it 😪
I was so confused why he only got 14
I have a 2021 2500 gas and got 17.5mpg from Indiana to Florida. Not towing but the bed was full of luggage etc. And 3 adults
That's really good MPG :)
I just tested my brand new GMC similar truck with the very same engine. Over 260 miles road trip, quite hilly, climbing no less than 7700 feet in the process, according to the computer, it averaged 20.7 mpgs, winter temperature 3 days before Christmas was about 18 F, there was little or no wind and my average speed was just 48 mph, with NO payload but the driver and embarked carburant.
Wow that's impressive, gotta be a record for this engine/trans. Thanks for sharing.
@@AdventureRocks Yes, rather satisfying. I will add it was a Pro 4x4 work truck, axle ratio 3,73 with double cab and long bed. Obviously it was set on 2 wheel drive all the way. The box was not covered which makes it LESS aerodynamic, so we could have had better mpgs had it been covered. We climbed 7700 feet but went down just as much. Average altitude above sea level was about 750 feet meaning oxygen content of the air was reduced by 2 percent on average. Gasoline was standard 87 octane. Wheels were rather small 17'' aluminium stock ome GMC with 265 70R17 Firestone LT tires Transforce AT2.
I have the same truck and it definitely likes to be around 60-65 when cruising for the best MPG. You can see your RPMs up around 1800-1900 at 75, whereas you'll be in the lower 1000s at 60-65. Probably depends on where you live and the highway speed limit, but in my state the highest speed limit on freeways is typically 65.
Great advice, thank you.
@@AdventureRocksThat's not to say I always max out my cruising at 65-I'm usually willing to sacrifice some MPG so I can get where I'm going 😁. Towing is a whole other story...
@@thunderhorse689 😁
My first interstate trip in my ‘24 HD, I locked on cruise control at 65 and got 19 mpg. Pretty much level ground.
nice thats awesome @@ellobo1326
The final drive ratio is unchanged. The 10 speed only added better power/torque management through the shift pattern for the gasser. Basically gave it better up to speed use from the gasser. Economy will be no different from the 6 spd.
The 10 speed has lower 1st 4:54 compared to 4.03 in the 6 speed and Reverse ratios in the 10 are 4:54 to 1 compared to the 6 speeds 3.06 to 1. Amazing difference when backing a heavy load. The 10 speed has a slightly higher gear (lower ratio) in the 10 gear than the 6 in 6 gear. The mpg difference between my 22 gas 6 speed and my 24 gas 10 is not noticeable.
I actually purchased my 22.5 refresh 1500 AT4 Dmax with the intention of waiting on the new 10 spd and interior refresh on the 2500 platform, and trading up after a year. But I really like my 1500, and the mpgs. But there are times I could still use a 2500. Especially as we get closer to needing vehicle to haul an RV.
Hi how is the truck doing? What trim level did you get? Did dealer sell below MSRP? I am looking to purchase a 2024 GMC 2500 6.6 gasser SLT trim
My previous 2018 Silverado 6.0 gasser got about 14.5 unloaded with wind at your back on the highway. My 2020 Silverado Duramax gets 23-24 on the highway unloaded. From what people say (on youtube reviews) the 10 speed does not make a difference in mpg. However, I would think being in the right gear at all times is what makes this gasser worth it versus the diesel or previous 6 speed.
The 10 speed does nothing unless you are a frequent tower (or lots of city driving). Open highway, final drive ratios are so close the difference is negligible. Best trans is the Mercedes 7 speed
If you can maintain 60-65 mph with the 10spd, I have gotten up to 18, almost 19, but only after it broke in, I didn't realize how much of a difference the break in would mean but it definitely showed me the difference!
I have 22 2500 6.6 gas and on 700 mile trip with mountains 550 miles of trip I get about 15.8 mpg with bed full of gear. Also running 37 inch, 12 ply tires with leveling kit at average over 70 mph
Great results!
Very nice! Do you intend on pulling with it?
Thank you, yes on towing. Getting it nice and broken in first.
I get about the same on my 5.3 Silverado.
Ok, and?
I have the 2024 AT4 and I didnt buy it for its fuel economy. If thats something you’re worried about, get a 1500. Nice video, good luck with the truck!
I hate comments like these. It's so ignorant. You can still want good fuel economy while still needing a larger truck. If this truck averaged 15mpg in its life I'd be happy.
@@fcodxdart1083So do I- I agree.
Thats a pretty good price for gas!
That's like 3.30 a gallon, that's where we are currently, it was down a lot more earlier this year but nothing I can do about that lol
I have a 2022 silverado 2500 HD 6.6l V8. Ive seen any where from 12-18mpg out of that truck. My 10k average right now is 13mpg. Im perfectly ok with the 6 speed.
Solid 💪🏻
I only drive 60 mph in my 2022 L8T 6 speed DCLB to save on gas. On OEM wheels and tires I would get 17-18mpg. Foung up to a 35x12.50r18 puts me around 14-15mpg. Lower RPMs would probably help but ive heard the 10 speed just gets lower mpg overall.
Great feedback, thank you for sharing.
It should get better mileage after the 10k mark. The 6 speed transmission runs 12-14 in town and 17-19 on the highway. Best 50 mile average is 21.2 mpg, 8-10 towing a 33 ft travel trailer when I drive it. When the wife drives it, 10mpg and for some reason the rear tires wear faster…….
😄
2011 Duramax 6.6 2500HD with 100,000 miles and just finished a round trip from Mid Michigan to SW Florida 1380 miles one way. Pulling 8500# RV and got 12.5 mpg going down. Coming back empty got 19.5 mpg. This was keeping up in the left lane on I75 both ways. I average 18.5 mpg in mixed rural and city driving. That will drop to 17.8 when the snow comes on. These are not one time readings. This truck has done this same trip more than a dozen times.
Those are amazing results. Sounds like a very healthy engine. Thank you for sharing.
Got my eye on a 6.6 gas Chevy HD, having trouble deciding between that and the Ford 7.3
I hear you. I was in the same boat and went back and forth. I still think either route Ford or GM would have been great choice. Lots of opinions of course, but I really like the 7.3 overall package too.
@@the_halfshell Will have to report back on that one. Have not noticed it yet, but still breaking it in and getting used to it.
No transmission does not skip shift .
Did you figure out how to get the gears up on the display? If so could you go thru the steps so I can also get it to display. I did not see how to do it in the manual
Only way I've learned so far is to quickly shift to L (manual) when you want to know current gear and it'll immediately show current gear assuming you don't slow down or speed up. But once you slow down or speed up great changes and what shows there is no longer current as the L mode is showing the highest limiting gear basically and defaults to current when you shift to L.
How was the dealer experience? Are they selling below MSRP now without any of their numerous BS dealer add-on accessory’s?
The best! Yes, check out ua-cam.com/video/t7rDx0RlJ1M/v-deo.htmlsi=9UB51evLa4k_vuDQ&t=1173 for more details.
14mpg 🧐. Bout what I get right now in my lifted 5.3 with 35s
I love my 2024 gasser. I hate the oil pump noise though. My only complaint.
Is that the sound I hear when approaching/unlocking doors outside and before starting the truck up? I was wondering if it was some kind of fuel pump sound, but it's all new to me.
@AdventureRocks no its the sound when you crank it and sounds like a hydraulic pump sucking air cavitating. Sometimes it will do it between 5th and 6th gear
@@richardoliver1621 thank you, still gettting used to mine and all the noises. I appreciate the heads-up on what to listen for!
I believe that you can NOT get the gear you are in on the instrament guages On your new truck, that is beautiful by the way. Enjoy your new truck. 😁
Thank you.
I have a 2021 gas 6.6 an not towing at 70 I get 15. 3 towing drops to 9
75 is just too fast for good mpg.
Sharp truck!
Thank you!
Have you tried driving over 30 mph with windows down? I rented a 2023 Siverado and handling became erratic when i put just one or two windows down. All four and it swerved all over the road. I have a 2012 Sierra that I need to replace and that experience made me wary of the GM trucks.
Yes, lots of driving with windows down. No issues on mine. If I only open rear and nothing else I get some buffeting, but that's with any truck. Oftentimes I'll do front plus rear slider.
Both the Ram and 2019 Chevy are trucks developed basically in the mid 2000’s. The Chevy was basically a reskin so many of the dimensions were the same and the Ram’s cab was released in 2009 on the 1500’s. So both were dinosaurs in 2019 and 2021.
Great points
Did you trade the 3500? And did you get what you expected on the trade?
Yes, but sold privately to get more $$. Trade offers weren't so great.
I just just bought a 2024 gmc 2500 and after refueling I never seen say 500 mile to empty when I got it the dash said 543 to empty with a full tank why is that
Range calculates based on most recent driving habits. At full economy you'd be looking at 500+ range on 36 gal, but city or towing, much lower.
Seriously?
My 2019 6.0 with 4.10 gears gets 15.0 at 70mph.
Ive got 2022 hd custom gas 6.6 81 thousand miles gas mileage 17 .3 at 70
Very nice!
What gear ratio is the truck?
I believe for 2024 with 10-speed they are all 3.73, no option for other ratios since the 10 gears kinda compensate.
This is correct.
Will you be towing a fifth wheel? Thanks
Travel trailer... Hopefully in the near future once it's built!
Are the seats comfortable?
At first I liked the RAM seats in my 21 Laramie better, but after a couple months driving the GMC I like them a lot. Having a lumbar is a must for me, and GMC delivers there. It's possible the higher trim levels have even more bolstering and support, but I'm quite content with the cloth seats in my SLE.
Do you think if you put on a cold air intake your mpg would increase?
@@calebking1452 Great question. I am not sure, but surely it wouldn't hurt, right? I plan to do a 2nd MPG run soon with engine broken in and 1st oil change to compare results.
Dealer probably used cheapest fuel. Can you run a test using 93 octane?
Great question, yes just 87 octane. I've always been curious if the 93 would deliver noticeable performance or economy. Will have to see if I can work that in the future. Thank you.
@@AdventureRocksI seriously doubt it.
Agreed, likely the case@@Icutmetal
my 2022 6.6l gas 6spd 2500 gets 14-15mpg average.
That's really good, especially for an HD truck.
Put a Whipple on it
Best i got with my 2024 3500 chevy 6.6l gas was 18.7
Nice! That's really good
@@AdventureRocks it was only one time. With the cold air setting in I idle my truck 5 to 10mins before work I get 13 mpg on 87. I am going to try running 2 tanks of 93 to see what it is a 2 tanks of 90 non ethanol
@@bigmurph1447I’d be very interested to know what comes of that test. I must be driving wrong because I got 13.1 MPG driving from Houston to Dallas.
Now I got 37” and I got 11 MPG.
@@rontopping2048 no wasn't down don't ask me how it got 18.7 it was only one time. Tfl truck did a test on the 2024 6.6l gas got 19mpg. Right now I get 13 mpg but I also idle my truck for 10mins every morning before I leave for work because it's cold out. In the summer I was get 15-16 mpg
Might want to compare your speedometer/odometer against a GPS for accuracy. Taller tires will show less mph & less miles driven.@@shogun4200
Believe me those GMC drank fuel you be lucky to get 300 miles on a tank when loaded
I hear you, definitely a downside with a gasser. I'm more into local short trips, so okay with the range.
Would the ford 6.8 liter do better?
You know I was really intrigued by the 6.8 between cost savings and similarity to 7.3. To me it didn't seem like you're sacrificing much in performance, yet saving a good bit of $$. Thought about ordering an XLT with 6.8, but went a different route. Still on my radar though.
@@AdventureRocks6.8 is XL only. Kinda dumb for them to do that.
@@SliderFury1 I am looking at the XL and WT trims and they are still 54K stripped down trucks. Soooooo over priced
@@the_halfshell yep. The the Chevy is only 600.00 cheaper than the F350. But they are basically the same price
@@SliderFury1You are absolutely right! My apologies. I remember now that was a slight factor in pushing me toward the GMC. Ford has some interesting packages on XL including 360 view and apperance upfront that made the XL build closer to XLT, but still lacking in other areas. The XL could be a real bargain though with the 6.8L.
I like the 2500 but never with a gas engine.
Gotta love the gas! 😎
Dead pedal was a deal breaker for me. Bought an older used ford instead.
I hear you. I've gotten used to it, but it's still strange to me why it sits proud of the gas pedal. Maybe I've just got long legs.
What's a dead pedal????
@@glenparks5175 just the small dummy pedal on the left side by wheel well to rest your foot. Some cars have one and others don't. Personal preference I guess.
the dead pedal was the deal breaker? You must be a tuff person to live with :)
@@glenparks5175 6:09
Yeah I think the killer here is doing 75mph. There's a huge difference between doing 60 to 65mph than 70 and above, it just drinks it. Lovely truck and nice vid. PS using lower ethanol fuels too help with mpg too
Great points
I’m so confused. TFL tested at over 19mpg highway. What gives? That’s a drastic difference!
Was that the Duramax maybe? Could be a fluke, if not. After 2 months of driving my truck with L8T I'd be surprised if I got over 16 miles per gallon going 70 mph unladen.
Winter gas blend maybe, flat terrain versus hills, driving style and speed, tire pressure just to name a few.
TFL usually only does short (either 100 or ~60 mile) loops for most of their MPG testing. Pretty easy to have a small anomaly cause a big difference with such a short test. I don't remember them doing a 6.6 gas/10 speed yet, but I might have forgot about it.
@@AdventureRocks It wasn’t. They are saying that is the gas.
@@jeffs2809 They did the gas 10 speed test on TFL. That video is what I am talking about. They are saying it tested at 19mpg.