Gmc Denali 2024 Diesel Mpg. Does anyone have any real world data on the 2024 6.6 gas v/s 6.6 diesel fuel economy. Detailed specs and features for the 2024 gmc sierra 1500 diesel at4 including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type,.

Those most concerned with fuel efficiency should entertain the optional diesel engine, which is rated up to 23 mpg city and 30 mpg highway. The 2024 gmc sierra 2500hd denali ultimate carries its 8,346 pounds of mass to 60 mph in a shockingly quick 6.5 seconds.