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2024 Gmc Sierra 3500hd At4 Mpg. Detailed specs and features for the 2024 gmc sierra 3500hd diesel denali ultimate including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine. Fuel economy of the 2024 gmc sierra.

Choose from a next generation gmc sierra 2500hd or 3500hd and learn more about the vehicle specs, trims and features available. Choose from either a gmc sierra 2500 hd or 3500 hd at4, and learn more about the vehicle specs, trims, and features available.