Based on data from 190 vehicles, 13,874 fuel-ups and 4,581,660 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.22 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 (41) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (34) SLT (44) AT4 (73)

Below you can see a distribution of the fuel-ups with 319 outliers (2.25%) removed.

Following shows the average MPG of each of the 190 vehicles in the system.

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• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 53 Fuel-ups

  Property of eizan70

• 17.2 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2020 • 231 Fuel-ups

  Property of jamesthebikeguy

• 19.6 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 28 Fuel-ups

  Property of ZPAXTON

• 22.2 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 71 Fuel-ups

  Property of Along411

• 23.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2023 • 83 Fuel-ups

  Property of jwbraam3

• 16.4 Avg MPG

• Black Betty

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2020 • 84 Fuel-ups

  Property of taintfair

• 15.5 Avg MPG

• 2020 GMC Sierra 1500 Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2020 • 87 Fuel-ups

  Property of sk83

• 22.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2024 • 5 Fuel-ups

  Property of Bigredcherokee

• 17.8 Avg MPG

• Kerry AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added May 2020 • 180 Fuel-ups

  Property of kmcloukey

• 14.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 74 Fuel-ups

  Property of weedtrucker

• 25.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 2.7L L4 GAS Automatic 6 Speed
  Added Apr 2023 • 26 Fuel-ups

  Property of Stenwood

• 19.4 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 • 87 Fuel-ups

  Property of BrianK

• 24.8 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 210 Fuel-ups

  Property of mcsgary

• 18.8 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 229 Fuel-ups

  Property of Boatman744

• 16.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 33 Fuel-ups

  Property of kvolpe

• 19.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2022 • 49 Fuel-ups

  Property of gcoil

• 22.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 217 Fuel-ups

  Property of mjp1850

• 14.2 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 54 Fuel-ups

  Property of MunsonedForLife

• 26.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 186 Fuel-ups

  Property of JettaFuelMileage

• 15.5 Avg MPG

• My Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 195 Fuel-ups

  Property of SEH22

• 17.7 Avg MPG

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