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Road Test: 2021 GMC Sierra 1500 Duramax 4WD Crew Cab AT4 CarbonPro

Clean Fleet Report

In 235 miles we averaged 25.2 mpg, but on a 100-mile all-freeway run with the adaptive cruise control set at 65 mph, we got an impressive 29.8 About those radio knobs and the climate control wheels: they are constructed using a cheap-feeling chromed plastic. Fuel economy for the 3.0-liter A signature stitch. Clean Fleet Report.

Sierra 96