Based on data from 191 vehicles, 15,021 fuel-ups and 4,952,840 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.23 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (84) 4.3L V6 GAS (1) 5.3L V8 GAS (52) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (37) SLT (45) AT4 (70)

Below you can see a distribution of the fuel-ups with 342 outliers (2.23%) removed.

Following shows the average MPG of each of the 191 vehicles in the system.

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• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 175 Fuel-ups

  Property of Knoname

• 20.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 133 Fuel-ups

  Property of jessemfa

• 23.0 Avg MPG

• Pretty Ass Red Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2020 • 95 Fuel-ups

  Property of BrianK

• 24.7 Avg MPG

• Bandit

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2023 • 73 Fuel-ups

  Property of bowden

• 24.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 199 Fuel-ups

  Property of JettaFuelMileage

• 15.4 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 92 Fuel-ups

  Property of robertt656

• 18.1 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2022 • 121 Fuel-ups

  Property of srlew

• 15.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 164 Fuel-ups

  Property of surfintx2004

• 20.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 84 Fuel-ups

  Property of weedtrucker

• 25.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 2.7L L4 GAS Automatic 6 Speed
  Added Apr 2023 • 34 Fuel-ups

  Property of Stenwood

• 19.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2023 • 30 Fuel-ups

  Property of theautopilot

• 16.9 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2024 • 208 Fuel-ups

  Property of kevinharper9

• 17.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2024 • 14 Fuel-ups

  Property of Jbonebrake

• 23.5 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 80 Fuel-ups

  Property of Along411

• 23.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 223 Fuel-ups

  Property of Kurrirra

• 15.6 Avg MPG

• 2020 GMC Sierra 1500 Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2020 • 90 Fuel-ups

  Property of sk83

• 22.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 126 Fuel-ups

  Property of crggmc

• 15.2 Avg MPG

• Moose

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2020 • 63 Fuel-ups

  Property of soundwise

• 20.4 Avg MPG

• Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 161 Fuel-ups

  Property of mattb5150

• 19.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added May 2024 • 7 Fuel-ups

  Property of kim98642

• 14.8 Avg MPG

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