Based on data from 192 vehicles, 15,664 fuel-ups and 5,162,298 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.21 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (85) 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 (38) SLT (45) AT4 (70)

Below you can see a distribution of the fuel-ups with 351 outliers (2.19%) removed.

Following shows the average MPG of each of the 192 vehicles in the system.

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• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 101 Fuel-ups

  Property of TigerDeAnn

• 18.1 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 222 Fuel-ups

  Property of pinkdream

• 16.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 128 Fuel-ups

  Property of elcount

• 24.6 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 27 Fuel-ups

  Property of PNaj

• 19.2 Avg MPG

• The Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 137 Fuel-ups

  Property of Mijo123

• 20.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 300 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• Sierra Denali 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Jul 2023 • 18 Fuel-ups

  Property of kcazatk_1

• 24.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Dec 2021 • 119 Fuel-ups

  Property of rudog805

• 18.1 Avg MPG

• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 134 Fuel-ups

  Property of jhhaney97

• 23.8 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 178 Fuel-ups

  Property of msova2

• 15.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 89 Fuel-ups

  Property of weedtrucker

• 25.3 Avg MPG

• My Sierra 1500

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

  Property of tylerbell

• 16.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 174 Fuel-ups

  Property of surfintx2004

• 19.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 54 Fuel-ups

  Property of roadwarrior51

• 17.8 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 171 Fuel-ups

  Property of riefej80

• 19.9 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 263 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 2024 • 9 Fuel-ups

  Property of coreywgrant

• 24.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 2.7L L4 GAS Automatic 6 Speed
  Added Apr 2023 • 40 Fuel-ups

  Property of Stenwood

• 19.5 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 74 Fuel-ups

  Property of MunsonedForLife

• 27.2 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 89 Fuel-ups

  Property of rmsevo

• 21.0 Avg MPG

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