What I Really Think About The New 6.6L Gas Silverado! WORTH IT?

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[nross]

The fact that it doesn’t have the active fuel management was the main reason I went with one.

[nathanlukeman]

Just bought a 2021 with 6.6 gas. Towing a fully loaded camper at 8500lbs I get about 10mpg depending on road conditions. Maybe a little more. Just a bed full of camping supplies and full of passengers I get almost 18mpg. Love the truck.

[gregorylute]

I just got a '24 2500 hd 6.6l gas with 10 speed. Went from a broken down'06 duramax. The new truck does everything better including towing.

[downshifter]

I think GM should bring back the 8.1. Or something close to it it. Nothing like a big block.

[paulmiller]

I think the 10 speed allison in the 6.6 gas will make a huge difference for towing. Nothing like being in the right gear and and power range for the engine.

[matthewanderson]

I’ve had them both in the current generation (2020 Duramax and now have a 2022 6.6 gas). Both crew cab, 4WD, short bed with 20s. The power difference is no comparison but I feel that’s to be expected comparing a turbo diesel to an NA small block. With that said the 6.6 gas is definitely no slouch, and at least in these new trucks empty driving there’s not much of a difference. You got to remember the 2020+ diesels weigh over 8, 000 pounds! So they’re a little slower than the previous generation.

Anyways, I daily drive my truck, and driving to work (30 mile round trip on 2 and four lane highways, lots of curves and hills) from speeds ranging from 35-65 mph my gas truck gets 14-15 mpg. The diesel got 16-17. Towing my 8.5’x24’ enclosed car trailer my gas truck gets 8.4-8.6 mpg and the diesel got 10.4-10.7. That’s on the same trip, same load (250ish mile round trip, lots of 6 and 7% grades and one 8%) and for lack of a better term, roads basically like a roller coaster. On mostly interstate trips and speeds my gas gets 17 and my diesel got 20.

So pretty much 2 mpg better in most situations and 3 on a trip. I don’t miss the diesel. I can still maintain or beat the posted speed limits on my racing trips (55 and 60 mph). Now sure, the diesel pulled the grades easier, especially the 8% but my gas truck does it.

The problem with the gas trucks is the 6L90 needs another gear between 2nd and 3rd. That 2024 with the 10 speed Allison will have solved that problem. For example on my 8% grade, it goes for 2 miles. 3rd gear is just too tall of a gear to pull the mountain in and 2nd is too short. But what ends up happening is I go WOT at about 65 mph and when the grade really starts getting steep I start losing speed down to about 53 mph and 3000 rpm. I then get a downshift to 2nd where it gains back to 65 mph and a little over 5000 rpm but then upshifts to 3rd. Start losing speed back down to about 57 or so mph but by that time the grade starts leveling off and I’m over the hill. That 10 speed will absolutely fix that.

Long comment but I’ve had them both. The diesel is nice, but the gas is no slouch and I’m not disappointed. I also have zero oil usage and I’m at 24, 000 miles now. I do change oil at 3000 miles for what it’s worth.

[uoldboat]

I have one after having an L5p and Lml. It's perfect for me. the 6 speed is just fine. After driving 170 hp 350's with 3 speed automatics for many years, this works great for me. Keeping things in perspective helps.

[medic]

I went from a 6.2 liter gas to the Duramax and I am actually spending less for fuel now. With my 2013 Silverado, I was spending roughly $275.00/month on gas and now I am at about $180.00-200.00/month. Plus I can haul so much more with this truck. I am happy that I switched over to diesel.

[rottlerpropertyservices]

Just bought a 2024 sierra 2500. The 6.6 gas seems to run well. I pull a dump trailer and excavator. So far so good.

[campnut]

I agree with most everything you said, especially the GMC looks much better in front. I have never had a diesel though. I went from a 2018, 6.0 2500 to a 22, 6.6 3500, I only have 2k miles on it. I tow a 12k gooseneck RV and recently purposely towed it up a mountain here in central PA just to see how it would do. Approx. 4 miles of 12% grade with 2 hairpin turns. It did better than I expected, until I had to slow for the sharp turns. It dogged pretty good until it kicked into low gear and picked up from there just fine. I get 14 - 15mpg driving same mountain to work every day. I get 7 - 9mpg when towing the RV. Again I haven't been spoiled by a diesel yet. I believe its about relativity.

[Eyore]

I switched to the 2500HD gasser back in '16. I love my diesels, but I'm over it with the emissions. Does everything i need it to do with zero issues

[nathanhiemstra]

I think it would be awesome to do a comparison video of a 6.6 liter gas vs 6.6 diesel. With the same 10 speed Allison. Side by side just gas vs diesel! My dad has a 14 gas 5.3 with a whipple supercharger and it puts like 500 to the ground. Puts a 30 ft trailer at 65 up inclines no problems! I’d love to see that on a newer gasser!

[weldorworx]

Down side . Only has 6 speed tranny . Why do we need so many gears ? I know 2 ppl . 8 speed tranny . Both of them are having issues
I got a dually . 5 speed . Im glad its not any more gears ! It would be constantly shifting up and down ! Ive had mine up to 100 mph . Still had more ! How fast do we need to go ?

[packingbone]

I have a 2020 6.6 and get 11-13mpg burns 1.5 quarts every 6, 000 miles. I have 88, 000 miles on it and have had no issues and rides very well and tows my 10, 000lb trailer well, I like the truck a lot no reason to buy a duramax and deal with emissions in my opinion for my useage.

[TKproductions]

Some thoughts to consider

#1: Gas engines warm up to operating temperature way faster than diesel. Getting the heat going in the winter will be way faster in the gasser.

#2: I have an 03 Hummer h2 (6.0L) and an 03 LB7. Both engines are untuned, The H2 gets 9mpg, the Duramax gets 20mpg. Fuel cost wise the Duramax wins.

#3: The gasser is an LS, give it some time and there will be plenty of aftermarket performance mods for it that will wake it up. My 6.0L jumped up from 316hp to 365hp on the factory tune just by converting to electric fans, cold air filter in the oem box, and a high flow exhaust system. LS engines are notorious for being detuned from the factory, and at least with the older engines they are in need of a mild cam swap to wake it up. I will say that the gen 4 6.2 LS was making 393hp back in 2008, so for a 6.56L to be that close in power these days tells me something is very poorly optimized with it and there is lots of room for improvement with aftermarket support. If you are not already familiar, Richard Holdner is great to learn from about LS stuff.

#4: If you are tuning it, it will be very tempting to use higher octane fuel to get more power out of it nullifying big cost benefits in fuel. 87oc is pretty much trash, so you would want to go at least with 89 for your base fuel tune tables.

#5: maximizing torque and hp rpm’s is key if you are trying to compete with diesel, if you are putting bigger tires on it be sure to regear your axles to compensate. The 10 speed would also help out a lot by always targeting the right rpm range for your desired power output.

Hope this helps. Best of luck to you brother!

[andygrundy]

Yeah I was hoping you were going to drive the new 10 speed. I've got the brother to your truck a 18 high country Duramax and have been seriously thinking about the 24 gas 6.6 with the new 10 speed. Was really disappointed they didn't up the hp numbers along with updating the trans but like you said tons of potential for power to be unlocked in that gas 6.6. not to mention they're $10k cheaper lol

[jonbrowning]

I bought a '22 GMC 2500HD gas for payload. No oil consumption as of yet, have averaged 14 mpg, with it in 4x4 much of the time. No issues with the truck at all as of yet.

[taylor]

The 6.6 gasser with a whipple screw blower is pretty awsome. And the 10 speed made a huge, huge difference towing.

[k.c.wingert]

I don’t understand why the keyboard warriors insist on comparing these gas trucks to diesels. If anything, compare it to the Ford 7.3L gas engine. There is a huge market for truck owners who need a HD chassis to pull campers or a compact tractor occasionally but don’t pull 20, 000+ pounds every single day. Unless you pull heavy every single day it is hard to justify a diesel.

[VAFarmer]

My 2001 2500hd 8.1 with Allison is still going strong. Stays hooked to a trailer and keeps it in the wind!