Based on data from 190 vehicles, 13,861 fuel-ups and 4,577,770 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 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 128 Fuel-ups

  Property of jmungaray

• 14.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2023 • 20 Fuel-ups

  Property of ddschroeder

• 18.8 Avg MPG

• Black Sierra

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Aug 2023 • 3 Fuel-ups

  Property of fernwoodnation

• 20.4 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2023 • 11 Fuel-ups

  Property of UndreB

• 18.7 Avg MPG

• My Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Extended Cab Pickup
  Added Aug 2020 • 165 Fuel-ups

  Property of braxx71

• 19.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 299 Fuel-ups

  Property of mja2770

• 16.4 Avg MPG

• Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 141 Fuel-ups

  Property of mattb5150

• 19.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 76 Fuel-ups

  Property of 3500

• 17.0 Avg MPG

• 2020 Sierra AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Oct 2020 • 122 Fuel-ups

  Property of DoomX

• 16.8 Avg MPG

• My AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2023 • 6 Fuel-ups

  Property of Corvette135

• 19.0 Avg MPG

• 20 Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 135 Fuel-ups

  Property of clemmer98

• 15.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 93 Fuel-ups

  Property of Mocek

• 18.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Apr 2020 • 78 Fuel-ups

  Property of Qbert

• 16.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jul 2020 • 140 Fuel-ups

  Property of chevyb

• 16.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 148 Fuel-ups

  Property of pauldelicati

• 13.0 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Sep 2020 • 10 Fuel-ups

  Property of Rexpelagi

• 30.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2022 • 23 Fuel-ups

  Property of BrainCandy

• 16.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2023 • 18 Fuel-ups

  Property of MotorBoater

• 25.8 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2020 • 112 Fuel-ups

  Property of wvajeff

• 15.8 Avg MPG

• Big Gray

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2020 • 91 Fuel-ups

  Property of wirowek

• 23.7 Avg MPG

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