Based on data from 189 vehicles, 13,947 fuel-ups and 4,607,299 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.23 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 (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (34) SLT (44) AT4 (72)

Below you can see a distribution of the fuel-ups with 319 outliers (2.24%) removed.

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

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• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 107 Fuel-ups

  Property of nicktcr

• 19.4 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 232 Fuel-ups

  Property of Boatman744

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 121 Fuel-ups

  Property of crggmc

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 2.7L L4 GAS Automatic 6 Speed
  Added Apr 2023 • 27 Fuel-ups

  Property of Stenwood

• 19.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 92 Fuel-ups

  Property of stuart1943

• 16.0 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 143 Fuel-ups

  Property of riefej80

• 20.0 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 77 Fuel-ups

  Property of rmsevo

• 20.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 6 Fuel-ups

  Property of Doc31

• 19.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2024 • 11 Fuel-ups

  Property of Jbonebrake

• 23.9 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 73 Fuel-ups

  Property of Along411

• 23.4 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 362 Fuel-ups

  Property of bdenman

• 19.2 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 144 Fuel-ups

  Property of jndelisl

• 17.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 22 Fuel-ups

  Property of sslack1970

• 17.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 125 Fuel-ups

  Property of mcginnmf16

• 15.4 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Aug 2020 • 118 Fuel-ups

  Property of juneau76

• 24.6 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 30 Fuel-ups

  Property of ZPAXTON

• 22.2 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 183 Fuel-ups

  Property of ItsMine

• 24.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 268 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• Chuck’s Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2023 • 114 Fuel-ups

  Property of Arcflash96

• 23.6 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 197 Fuel-ups

  Property of pinkdream

• 16.0 Avg MPG

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