Based on data from 196 vehicles, 15,766 fuel-ups and 5,206,038 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 (88) 4.3L V6 GAS (1) 5.3L V8 GAS (54) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (50) Any Submodel Base (3) SLE (10) Elevation (28) Denali (38) SLT (45) AT4 (72)

Below you can see a distribution of the fuel-ups with 358 outliers (2.22%) 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 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 43 Fuel-ups

  Property of kvolpe

• 19.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 93 Fuel-ups

  Property of weedtrucker

• 25.3 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 268 Fuel-ups

  Property of Boatman744

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 273 Fuel-ups

  Property of mjp1850

• 14.1 Avg MPG

• AT4

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

  Property of riefej80

• 19.8 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 231 Fuel-ups

  Property of pinkdream

• 15.5 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 441 Fuel-ups

  Property of bdenman

• 19.0 Avg MPG

• GMC

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Dec 2024 • 71 Fuel-ups

  Property of Bill_kmetz

• 17.8 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 105 Fuel-ups

  Property of robertt656

• 17.8 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2022 • 135 Fuel-ups

  Property of srlew

• 14.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2024 • 16 Fuel-ups

  Property of coreywgrant

• 23.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 70 Fuel-ups

  Property of sslack1970

• 18.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 97 Fuel-ups

  Property of rbennett011

• 14.7 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 226 Fuel-ups

  Property of ItsMine

• 23.9 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 179 Fuel-ups

  Property of jndelisl

• 17.2 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2020 • 274 Fuel-ups

  Property of jamesthebikeguy

• 19.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2023 • 132 Fuel-ups

  Property of jwbraam3

• 16.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 22 Fuel-ups

  Property of salexshirk

• 17.0 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 95 Fuel-ups

  Property of Along411

• 23.3 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 85 Fuel-ups

  Property of MunsonedForLife

• 26.2 Avg MPG

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