Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro
Clean Fleet Report
MARCH 30, 2021
Smooth, Powerful Diesel Performance. Clean Fleet Report. 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. mpg, but on a 100-mile all-freeway run with the adaptive cruise control set at 65 mph, we got an impressive 29.8
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