Based on data from 198 vehicles, 15,989 fuel-ups and 5,276,180 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 (88) 4.3L V6 GAS (1) 5.3L V8 GAS (55) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (51) Any Submodel Base (3) SLE (10) Elevation (29) Denali (38) SLT (45) AT4 (73)

Below you can see a distribution of the fuel-ups with 362 outliers (2.21%) removed.

Following shows the average MPG of each of the 198 vehicles in the system.

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• Sierra

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2020 • 163 Fuel-ups

  Property of Griffith

• 23.3 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 90 Fuel-ups

  Property of MunsonedForLife

• 26.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 145 Fuel-ups

  Property of jessemfa

• 23.1 Avg MPG

• Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 21 Fuel-ups

  Property of clayjohnson

• 22.2 Avg MPG

• My Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 230 Fuel-ups

  Property of SEH22

• 18.1 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 114 Fuel-ups

  Property of robertt656

• 17.5 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 99 Fuel-ups

  Property of rmsevo

• 21.0 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2022 • 141 Fuel-ups

  Property of srlew

• 14.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 316 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• GMC

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Dec 2024 • 73 Fuel-ups

  Property of Bill_kmetz

• 17.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 75 Fuel-ups

  Property of sslack1970

• 18.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 284 Fuel-ups

  Property of mjp1850

• 14.1 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 181 Fuel-ups

  Property of riefej80

• 19.8 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 452 Fuel-ups

  Property of bdenman

• 19.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 144 Fuel-ups

  Property of jtabor

• 16.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 115 Fuel-ups

  Property of eizan70

• 16.1 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 271 Fuel-ups

  Property of Boatman744

• 17.0 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 205 Fuel-ups

  Property of bmrohrer

• 15.0 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 236 Fuel-ups

  Property of nalani83

• 15.0 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 229 Fuel-ups

  Property of ItsMine

• 23.9 Avg MPG

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