2024 Sierra Denali Specs Mpg. Official fuel economy figures put the 2024 gmc sierra 1500 denali ultimate at 15 mpg (16.0 l/100 km) city and 19 mpg (12.1 l/100 km) highway. The sierra 1500 also can be had with adaptive dampers and wheels as large as 22 inches.
Available with a choice of engines, it comes in a singular body style, the crew cab. The 2024 gmc sierra 2500hd denali ultimate carries its 8,346 pounds of mass to 60 mph in a shockingly quick 6.5 seconds.