Based on data from 188 vehicles, 13,893 fuel-ups and 4,592,187 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.24 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 (39) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (34) SLT (44) AT4 (71)

Below you can see a distribution of the fuel-ups with 319 outliers (2.24%) removed.

Following shows the average MPG of each of the 188 vehicles in the system.

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• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 75 Fuel-ups

  Property of weedtrucker

• 25.0 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2020 • 127 Fuel-ups

  Property of Bensontbjj1

• 17.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 269 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 123 Fuel-ups

  Property of jessemfa

• 23.0 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Crew Cab Pickup
  Added Dec 2023 • 20 Fuel-ups

  Property of cmore

• 16.9 Avg MPG

• 2020 GMC Sierra 1500 Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2020 • 88 Fuel-ups

  Property of sk83

• 22.5 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 12 Fuel-ups

  Property of PNaj

• 18.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 108 Fuel-ups

  Property of nicktcr

• 19.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2024 • 7 Fuel-ups

  Property of Bigredcherokee

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 29 Fuel-ups

  Property of roadwarrior51

• 17.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2023 • 36 Fuel-ups

  Property of tylerbell

• 16.6 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 155 Fuel-ups

  Property of Knoname

• 20.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Dec 2021 • 96 Fuel-ups

  Property of rudog805

• 18.2 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 251 Fuel-ups

  Property of nightrock548

• 17.1 Avg MPG

• My Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 198 Fuel-ups

  Property of SEH22

• 17.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 23 Fuel-ups

  Property of sslack1970

• 17.4 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 363 Fuel-ups

  Property of bdenman

• 19.2 Avg MPG

• Sierra Denali 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Jul 2023 • 11 Fuel-ups

  Property of kcazatk_1

• 24.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 184 Fuel-ups

  Property of bmh4301

• 13.8 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 197 Fuel-ups

  Property of nalani83

• 15.2 Avg MPG

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