Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro
Clean Fleet Report
MARCH 30, 2021
mpg, but on a 100-mile all-freeway run with the adaptive cruise control set at 65 mph, we got an impressive 29.8 The 120-volt power outlet is a useful feature, as was the running board step and the corner steps on the rear bumper outer edges. Fuel economy for the 3.0-liter In 235 miles we averaged 25.2 Clean Fleet Report.
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