Jun 23, 2023 · Here to learn a little about my 2024 GMC 2500 with the 6.6 gas engine and the truck in general. I retired and this is only my fourth GM product in 52 years of driving.

Mar 28, 2025 · I bought a new 2025 Silverado 2500HD with the 6.6 gas engine. Everything I researched said the fuel economy was 14-16 city/ 17-18 hwy, but after driving it for 3 weeks I'm only getting …

Nov 9, 2019 · Anyone have a new 2020 HD with 6.6L gas engine? I'm curious what kind of gas mileage you have been getting, particularly when unloaded. Thanks!

Jun 6, 2024 · Thank you. That’s about what I do. Although I used to run a ‘01 2500HD with 6.0 until it told me to change. 213k before I sold it and never a problem. But that was a much different engine …

Dec 20, 2024 · Beginning with the 2020 model, the 2500's stopped using the 6.0 and introduced a 6,.6L gas (rpo LT8), and still with the HD version of the GM 6 speed. The 2020 diesels switched to the …

Jan 26, 2023 · GM's new 6.6L L8T gasoline V8 engine is a cast-iron unit with aluminum heads that delivers a stout 401 horsepower and 464 ft-lb of torque in heavy-duty models of the Chevrolet …

Feb 12, 2024 · Hello all. Wanted to introduce myself and express my happiness with the 6.6 gas in my 2021 2500HD double cab long bed 4x4 auto WT. Truck has performed well for my towing under …

Mar 3, 2020 · However, my question to y'all is what if any feedback do folks have on this new gas 6.6 L V8 that is replacing the tried and true 6.0 L V8 engine that Chevy/GMC had for years in their 2500s? …

Dec 21, 2025 · I have a 2024 Chevy 2500hd with the 6.6 gas and 10 speed transmission. I bought it new and it now has 39,000 miles. It's started to have a slight shutter at highway speeds while going uphill. …

Dec 1, 2023 · Nova4525 Discussion starter 2 posts · Joined 2023 #3 · Dec 1, 2023 I’m looking at a 2021 GMC Sierra 2500 gas and was hoping for it to not have a AFM I currently have a 2009 Silverado …