2024 Sierra Denali Hd Mpg. Looking at a new 2024 at4 and just curious if the 10 speed transmission helps with mpg. The 2024 gmc sierra hd denali ultimate, refreshed for the 2024 model year, is gmc's most premium, luxurious and technologically advanced truck yet.
2024 gm hd pickup specifications. Detailed specs and features for the 2024 gmc sierra 2500hd including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more.