2024 At4 2024 Duramax Mpg. I purchased a 2022 gmc 2500 at4 with a 6.6 gasser after previously having a 2016 and a 2010 6.6 duramax. Detailed specs and features for the 2024 gmc sierra 1500 diesel at4 including dimensions, horsepower, engine, capacity, fuel economy,
Current truck is a 2014 duramax with the 6 speed. Click below to find your next car.