2020 GMC Sierra MPG

Based on data from 3 vehicles, 462 fuel-ups and 171,999 miles of driving, the 2020 GMC Sierra gets a combined Avg MPG of 15.02 with a 0.26 MPG margin of error.

Below you can see a distribution of the fuel-ups with 34 outliers (6.85%) removed.

Following shows the average MPG of each of the 3 vehicles in the system.

• 2020 Sierra

  2020 GMC Sierra AT4 V8 DIESEL
  Added Jan 2025 • 189 Fuel-ups

  Property of Mikemjr1

• 14.5 Avg MPG

• Garrett’s Truck

  2020 GMC Sierra AT4 5.3L V8 GAS Automatic 8 Speed
  Added Dec 2019 • 195 Fuel-ups

  Property of GMEAUX

• 16.5 Avg MPG

• 2020 Sierra

  2020 GMC Sierra AT4 V8 DIESEL
  Added Sep 2021 • 118 Fuel-ups

  Property of Mikemjr1

• 15.1 Avg MPG