Based on data from 190 vehicles, 13,867 fuel-ups and 4,579,486 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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• Sierra AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 123 Fuel-ups

  Property of bgweed

• 15.6 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 359 Fuel-ups

  Property of bdenman

• 19.3 Avg MPG

• Blanca

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

  Property of adolrn

• 17.5 Avg MPG

• Babymax

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 51 Fuel-ups

  Property of M8trix1469

• 20.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 104 Fuel-ups

  Property of nicktcr

• 19.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 90 Fuel-ups

  Property of stuart1943

• 16.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 200 Fuel-ups

  Property of AnglerAT

• 25.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 150 Fuel-ups

  Property of surfintx2004

• 20.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 21 Fuel-ups

  Property of sslack1970

• 17.4 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 157 Fuel-ups

  Property of bmrohrer

• 14.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 207 Fuel-ups

  Property of Kurrirra

• 15.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2024 • 10 Fuel-ups

  Property of Jbonebrake

• 23.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 75 Fuel-ups

  Property of rbennett011

• 14.5 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2020 • 173 Fuel-ups

  Property of JW46

• 16.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 53 Fuel-ups

  Property of eizan70

• 17.2 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2020 • 231 Fuel-ups

  Property of jamesthebikeguy

• 19.6 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 247 Fuel-ups

  Property of nightrock548

• 17.0 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 28 Fuel-ups

  Property of ZPAXTON

• 22.2 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 71 Fuel-ups

  Property of Along411

• 23.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2023 • 83 Fuel-ups

  Property of jwbraam3

• 16.4 Avg MPG

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