2024 Gmc 3500hd Duramax Mpg. I put 22,000 miles on it making 13. Detailed specs and features for the 2024 gmc sierra 3500hd including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more.
I would never believe anyone that says they get 20+ mpg with their duramax diesel in a 2500 or 3500. Denali goes ultimate, at4x joins the ranks.