Based on data from 198 vehicles, 15,957 fuel-ups and 5,261,866 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 (89) 4.3L V6 GAS (1) 5.3L V8 GAS (55) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (50) Any Submodel Base (3) SLE (10) Elevation (29) Denali (39) SLT (45) AT4 (72)

Below you can see a distribution of the fuel-ups with 358 outliers (2.19%) removed.

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

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• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 63 Fuel-ups

  Property of roadwarrior51

• 17.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 211 Fuel-ups

  Property of JettaFuelMileage

• 15.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 110 Fuel-ups

  Property of TigerDeAnn

• 18.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2024 • 31 Fuel-ups

  Property of Josh6535

• 16.9 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 227 Fuel-ups

  Property of ItsMine

• 23.9 Avg MPG

• Leonardo Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 87 Fuel-ups

  Property of Bippin

• 15.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 179 Fuel-ups

  Property of surfintx2004

• 19.9 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 260 Fuel-ups

  Property of msteiner17

• 17.0 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 67 Fuel-ups

  Property of ZPAXTON

• 21.9 Avg MPG

• Babymax

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 57 Fuel-ups

  Property of M8trix1469

• 20.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 136 Fuel-ups

  Property of crggmc

• 15.1 Avg MPG

• Pretty Ass Red Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2020 • 102 Fuel-ups

  Property of BrianK

• 24.6 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 196 Fuel-ups

  Property of Knoname

• 20.1 Avg MPG

• Moose

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2020 • 63 Fuel-ups

  Property of soundwise

• 20.4 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 181 Fuel-ups

  Property of mcginnmf16

• 15.2 Avg MPG

• Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 166 Fuel-ups

  Property of mattb5150

• 19.5 Avg MPG

• Sierra Denali 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Jul 2023 • 22 Fuel-ups

  Property of kcazatk_1

• 24.7 Avg MPG

• GMC Sierra 3.0 DirtyMax

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2024 • 24 Fuel-ups

  Property of markmey

• 23.0 Avg MPG

• Kadens Truck

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2024 • 3 Fuel-ups

  Property of kadenwalker357

• 14.1 Avg MPG

• Kerry AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added May 2020 • 212 Fuel-ups

  Property of kmcloukey

• 14.9 Avg MPG

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