Based on data from 196 vehicles, 15,843 fuel-ups and 5,231,425 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 (88) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (50) Any Submodel Base (3) SLE (10) Elevation (27) Denali (38) SLT (46) AT4 (72)

Below you can see a distribution of the fuel-ups with 361 outliers (2.23%) removed.

Following shows the average MPG of each of the 196 vehicles in the system.

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• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 104 Fuel-ups

  Property of A-Aron6

• 17.0 Avg MPG

• HUNK

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 99 Fuel-ups

  Property of Smokeetr

• 18.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 135 Fuel-ups

  Property of crggmc

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 141 Fuel-ups

  Property of nicktcr

• 19.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 268 Fuel-ups

  Property of mjp1850

• 14.1 Avg MPG

• Kerry AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added May 2020 • 212 Fuel-ups

  Property of kmcloukey

• 14.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 306 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 241 Fuel-ups

  Property of mbnereim

• 16.4 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 82 Fuel-ups

  Property of MunsonedForLife

• 26.3 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 • 101 Fuel-ups

  Property of BrianK

• 24.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 108 Fuel-ups

  Property of TigerDeAnn

• 18.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Dec 2021 • 124 Fuel-ups

  Property of rudog805

• 18.1 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 195 Fuel-ups

  Property of bmrohrer

• 15.0 Avg MPG

• Blanca

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2017 • 51 Fuel-ups

  Property of adolrn

• 17.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 91 Fuel-ups

  Property of weedtrucker

• 25.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2023 • 129 Fuel-ups

  Property of jwbraam3

• 16.2 Avg MPG

• Sierra Denali 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Jul 2023 • 22 Fuel-ups

  Property of kcazatk_1

• 24.7 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 182 Fuel-ups

  Property of msova2

• 15.4 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 90 Fuel-ups

  Property of Along411

• 23.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 177 Fuel-ups

  Property of surfintx2004

• 19.9 Avg MPG

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