2025 Gmc Sierra 2025 Duramax. I tested a 2023 gmc sierra 1500, which carries. Vehicle engine drive wheels transmission city mpg highway mpg combined mpg;

* and an available max towing capacity of up to 36,000 lbs. The new 2025 gmc sierra hd pickup truck pulls your world with turbocharged power and an impressive lineup of trims that includes the first ever denali ultimate.