2024 Duramax Fuel Mileage Comparison. 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. I left for the adventure planning to drive normally without towing or hypermiling to affect fuel.

Compare the gas mileage and greenhouse gas emissions of new and used cars and trucks. Interior, comfort, and cargo pickup trucks.