Based on data from 189 vehicles, 14,656 fuel-ups and 4,832,702 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 (84) 4.3L V6 GAS (1) 5.3L V8 GAS (52) 6.2L V8 GAS (40) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (45) Any Submodel Base (3) SLE (10) Elevation (26) Denali (35) SLT (45) AT4 (70)

Below you can see a distribution of the fuel-ups with 335 outliers (2.23%) removed.

Following shows the average MPG of each of the 189 vehicles in the system.

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• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 122 Fuel-ups

  Property of jhhaney97

• 23.9 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 156 Fuel-ups

  Property of jndelisl

• 17.3 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 206 Fuel-ups

  Property of pinkdream

• 16.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 105 Fuel-ups

  Property of stuart1943

• 15.9 Avg MPG

• Chuck’s Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2023 • 129 Fuel-ups

  Property of Arcflash96

• 22.7 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2020 • 189 Fuel-ups

  Property of JW46

• 16.4 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 266 Fuel-ups

  Property of nightrock548

• 17.1 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2020 • 244 Fuel-ups

  Property of jamesthebikeguy

• 19.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 215 Fuel-ups

  Property of AnglerAT

• 25.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 196 Fuel-ups

  Property of bmh4301

• 13.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2024 • 17 Fuel-ups

  Property of Bigredcherokee

• 16.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2024 • 15 Fuel-ups

  Property of Josh6535

• 18.6 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 222 Fuel-ups

  Property of mcsgary

• 18.8 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 126 Fuel-ups

  Property of AbnZoomie

• 15.4 Avg MPG

• Kerry AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added May 2020 • 192 Fuel-ups

  Property of kmcloukey

• 14.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2023 • 48 Fuel-ups

  Property of tylerbell

• 16.8 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 206 Fuel-ups

  Property of nalani83

• 14.9 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 387 Fuel-ups

  Property of bdenman

• 19.2 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 65 Fuel-ups

  Property of MunsonedForLife

• 27.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 116 Fuel-ups

  Property of nicktcr

• 19.4 Avg MPG

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