Based on data from 192 vehicles, 15,614 fuel-ups and 5,146,558 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 (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 350 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 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 91 Fuel-ups

  Property of rbennett011

• 14.7 Avg MPG

• Sierra Denali 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Jul 2023 • 17 Fuel-ups

  Property of kcazatk_1

• 24.9 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2020 • 262 Fuel-ups

  Property of jamesthebikeguy

• 19.6 Avg MPG

• Grandpa’s Bigger Rig

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2024 • 19 Fuel-ups

  Property of FredWilliam

• 25.5 Avg MPG

• HUNK

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 96 Fuel-ups

  Property of Smokeetr

• 18.9 Avg MPG

• Crimson Ride

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2020 • 165 Fuel-ups

  Property of texbama

• 21.2 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 221 Fuel-ups

  Property of pinkdream

• 16.1 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 131 Fuel-ups

  Property of AbnZoomie

• 15.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 138 Fuel-ups

  Property of jessemfa

• 23.1 Avg MPG

• Kerry AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added May 2020 • 204 Fuel-ups

  Property of kmcloukey

• 14.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added May 2024 • 16 Fuel-ups

  Property of kim98642

• 14.6 Avg MPG

• Babymax

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 55 Fuel-ups

  Property of M8trix1469

• 20.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2024 • 25 Fuel-ups

  Property of Josh6535

• 19.9 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2024 • 211 Fuel-ups

  Property of kevinharper9

• 17.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 130 Fuel-ups

  Property of crggmc

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2023 • 34 Fuel-ups

  Property of theautopilot

• 17.1 Avg MPG

• Moose

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2020 • 63 Fuel-ups

  Property of soundwise

• 20.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 38 Fuel-ups

  Property of kvolpe

• 19.5 Avg MPG

• The Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 136 Fuel-ups

  Property of Mijo123

• 20.9 Avg MPG

• 2020 Truck

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 56 Fuel-ups

  Property of rdruster

• 23.5 Avg MPG

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