Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro
Clean Fleet Report
MARCH 30, 2021
Smooth, Powerful Diesel Performance. There is a low diesel rumble upon start-up that becomes a nice note when accessing the ample torque to get off the line, but then purrs at freeway speeds. liter Duramax turbodiesel is EPA rated at 22 mpg city/26 highway/24 combined. News: Pickup Trucks Make Big Power/MPG Moves.
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