Based on data from 190 vehicles, 13,926 fuel-ups and 4,599,190 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 318 outliers (2.23%) removed.

Following shows the average MPG of each of the 190 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 • 154 Fuel-ups

  Property of Knoname

• 20.3 Avg MPG

• Leonardo Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 54 Fuel-ups

  Property of Bippin

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 55 Fuel-ups

  Property of eizan70

• 17.2 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 158 Fuel-ups

  Property of bmrohrer

• 14.9 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 218 Fuel-ups

  Property of msteiner17

• 17.0 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 29 Fuel-ups

  Property of ZPAXTON

• 22.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 22 Fuel-ups

  Property of sslack1970

• 17.4 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 11 Fuel-ups

  Property of PNaj

• 18.7 Avg MPG

• HUNK

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 84 Fuel-ups

  Property of Smokeetr

• 19.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2024 • 6 Fuel-ups

  Property of Bigredcherokee

• 17.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 219 Fuel-ups

  Property of mjp1850

• 14.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 208 Fuel-ups

  Property of Kurrirra

• 15.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2023 • 22 Fuel-ups

  Property of theautopilot

• 16.6 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 196 Fuel-ups

  Property of pinkdream

• 16.0 Avg MPG

• Kerry AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added May 2020 • 181 Fuel-ups

  Property of kmcloukey

• 14.7 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 142 Fuel-ups

  Property of riefej80

• 20.0 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2020 • 94 Fuel-ups

  Property of jjuppyh

• 22.6 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 249 Fuel-ups

  Property of nightrock548

• 17.1 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 231 Fuel-ups

  Property of Boatman744

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2023 • 35 Fuel-ups

  Property of tylerbell

• 16.6 Avg MPG

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