2020 GMC Sierra MPG
Based on data from 2 vehicles, 266 fuel-ups and 99,501 miles of driving, the 2020 GMC Sierra gets a combined Avg MPG of 15.64 with a 0.35 MPG margin of error.
Below you can see a distribution of the fuel-ups with 13 outliers (4.66%) removed.
2020 GMC Sierras For Sale Nearby
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Garrett’s Truck
2020 GMC Sierra AT4 5.3L V8 GAS Automatic 8 Speed
Added Dec 2019 • 164 Fuel-upsProperty of GMEAUX
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16.7 Avg MPG
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2020 Sierra
2020 GMC Sierra AT4 V8 DIESEL
Added Sep 2021 • 118 Fuel-upsProperty of Mikemjr1
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15.1 Avg MPG