Based on data from 190 vehicles, 13,864 fuel-ups and 4,578,573 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 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 120 Fuel-ups

  Property of jessemfa

• 23.0 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2020 • 125 Fuel-ups

  Property of Bensontbjj1

• 17.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 116 Fuel-ups

  Property of jtabor

• 16.6 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 141 Fuel-ups

  Property of riefej80

• 20.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 139 Fuel-ups

  Property of SRolfe

• 25.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2024 • 3 Fuel-ups

  Property of Josh6535

• 16.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 206 Fuel-ups

  Property of Kurrirra

• 15.5 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 249 Fuel-ups

  Property of Bowtie76

• 14.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 149 Fuel-ups

  Property of surfintx2004

• 20.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2020 • 123 Fuel-ups

  Property of brianjadams

• 14.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 110 Fuel-ups

  Property of elcount

• 24.5 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 156 Fuel-ups

  Property of msova2

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 199 Fuel-ups

  Property of AnglerAT

• 25.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 77 Fuel-ups

  Property of A-Aron6

• 16.8 Avg MPG

• Sierra

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2024 • 57 Fuel-ups

  Property of nick8924

• 15.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 5 Fuel-ups

  Property of Doc31

• 18.3 Avg MPG

• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 110 Fuel-ups

  Property of jhhaney97

• 23.8 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 181 Fuel-ups

  Property of ItsMine

• 24.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2023 • 21 Fuel-ups

  Property of theautopilot

• 16.5 Avg MPG

• Grandpa’s Bigger Rig

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2024 • 3 Fuel-ups

  Property of FredWilliam

• 25.6 Avg MPG

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