Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro
Clean Fleet Report
MARCH 30, 2021
Not enough can be said about how excellent the General Motors 3.0L liter Duramax turbodiesel is EPA rated at 22 mpg city/26 highway/24 combined. mpg, but on a 100-mile all-freeway run with the adaptive cruise control set at 65 mph, we got an impressive 29.8 News: Pickup Trucks Make Big Power/MPG Moves.
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