2025 Duramax Fuel Mileage Per Km. Your mileage may vary, as the fuel economy figures differ depending on a few key factors. A camper is in my future plans.
According to the most recent fuel economy testing from car and driver, the diesel silverado 2500hd gets 18 mpg in the city and 21 mpg on the highway. The duramax diesel engine and its insane torque is the best thing about this truck.