Based on data from 180 vehicles, 12,099 fuel-ups and 4,025,547 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.31 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (82) 4.3L V6 GAS (1) 5.3L V8 GAS (47) 6.2L V8 GAS (38) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (44) Any Submodel Base (3) SLE (10) Elevation (26) Denali (31) SLT (40) AT4 (70)

Below you can see a distribution of the fuel-ups with 299 outliers (2.41%) removed.

Following shows the average MPG of each of the 180 vehicles in the system.

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• Truck

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 9 Speed Extended Cab Pickup
  Added Aug 2020 • 153 Fuel-ups

  Property of Bw1881

• 14.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 199 Fuel-ups

  Property of nightrock548

• 16.9 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2020 • 210 Fuel-ups

  Property of jamesthebikeguy

• 19.7 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 36 Fuel-ups

  Property of MunsonedForLife

• 28.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 191 Fuel-ups

  Property of Kurrirra

• 15.5 Avg MPG

• Diana’s AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 124 Fuel-ups

  Property of dianabass

• 22.3 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 297 Fuel-ups

  Property of bdenman

• 19.6 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2020 • 148 Fuel-ups

  Property of JW46

• 16.4 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 175 Fuel-ups

  Property of mcsgary

• 18.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 169 Fuel-ups

  Property of mbnereim

• 16.4 Avg MPG

• Sierra AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2023 • 32 Fuel-ups

  Property of kdavismt

• 15.8 Avg MPG

• 2020 GMC AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2023 • 14 Fuel-ups

  Property of Risser

• 23.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 6 Fuel-ups

  Property of eizan70

• 18.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2023 • 37 Fuel-ups

  Property of jwbraam3

• 16.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 58 Fuel-ups

  Property of rbennett011

• 14.3 Avg MPG

• Moose

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2020 • 24 Fuel-ups

  Property of soundwise

• 17.9 Avg MPG

• ACK GMC 1500 SIERRA

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 156 Fuel-ups

  Property of ack17

• 17.2 Avg MPG

• The Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 108 Fuel-ups

  Property of Mijo123

• 21.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 63 Fuel-ups

  Property of stuart1943

• 16.1 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 197 Fuel-ups

  Property of Boatman744

• 16.8 Avg MPG

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