Based on data from 160 vehicles, 9,019 fuel-ups and 3,057,168 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.55 with a 0.11 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (74) 4.3L V6 GAS (1) 5.3L V8 GAS (38) 6.2L V8 GAS (35) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (36) Any Submodel Base (2) SLE (10) Denali (26) Elevation (26) SLT (34) AT4 (62)

Below you can see a distribution of the fuel-ups with 90 outliers (0.99%) removed.

Following shows the average MPG of each of the 160 vehicles in the system.

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• Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 84 Fuel-ups

  Property of bmrohrer

• 15.2 Avg MPG

• Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 122 Fuel-ups

  Property of mattb5150

• 19.9 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 79 Fuel-ups

  Property of AbnZoomie

• 15.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 39 Fuel-ups

  Property of Mazerk

• 24.7 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 110 Fuel-ups

  Property of pinkdream

• 16.1 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2020 • 75 Fuel-ups

  Property of Bensontbjj1

• 17.4 Avg MPG

• 20 Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 101 Fuel-ups

  Property of clemmer98

• 15.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 144 Fuel-ups

  Property of JettaFuelMileage

• 15.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Dec 2021 • 32 Fuel-ups

  Property of rudog805

• 18.2 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 81 Fuel-ups

  Property of riefej80

• 19.9 Avg MPG

• Big Gray

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2020 • 84 Fuel-ups

  Property of wirowek

• 23.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 158 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 Jul 2022 • 14 Fuel-ups

  Property of A-Aron6

• 17.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 168 Fuel-ups

  Property of Bowtie76

• 13.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 107 Fuel-ups

  Property of bmh4301

• 14.4 Avg MPG

• Denna

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 85 Fuel-ups

  Property of knightbsandy

• 24.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 70 Fuel-ups

  Property of jmungaray

• 14.4 Avg MPG

• Truck

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 9 Speed Extended Cab Pickup
  Added Aug 2020 • 105 Fuel-ups

  Property of Bw1881

• 15.2 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 199 Fuel-ups

  Property of bdenman

• 20.4 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 75 Fuel-ups

  Property of Mocek

• 19.0 Avg MPG

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