Based on data from 195 vehicles, 15,793 fuel-ups and 5,213,866 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.21 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (87) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (50) Any Submodel Base (3) SLE (10) Elevation (26) Denali (38) SLT (46) AT4 (72)

Below you can see a distribution of the fuel-ups with 352 outliers (2.18%) removed.

Following shows the average MPG of each of the 195 vehicles in the system.

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• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2022 • 127 Fuel-ups

  Property of srlew

• 15.0 Avg MPG

• The Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 140 Fuel-ups

  Property of Mijo123

• 20.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2024 • 28 Fuel-ups

  Property of Josh6535

• 16.7 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 433 Fuel-ups

  Property of bdenman

• 19.1 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 194 Fuel-ups

  Property of Knoname

• 20.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 266 Fuel-ups

  Property of mjp1850

• 14.1 Avg MPG

• Sierra AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Dec 2024 • 7 Fuel-ups

  Property of EMWill

• 15.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 140 Fuel-ups

  Property of nicktcr

• 19.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 101 Fuel-ups

  Property of eizan70

• 15.9 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 • 22 Fuel-ups

  Property of markmey

• 23.1 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 265 Fuel-ups

  Property of Boatman744

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 140 Fuel-ups

  Property of jtabor

• 16.5 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 • 101 Fuel-ups

  Property of BrianK

• 24.7 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 90 Fuel-ups

  Property of clo004

• 15.4 Avg MPG

• 2020 Sierra

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2020 • 269 Fuel-ups

  Property of jamesthebikeguy

• 19.6 Avg MPG

• My Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 220 Fuel-ups

  Property of SEH22

• 18.2 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 221 Fuel-ups

  Property of ItsMine

• 23.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 226 Fuel-ups

  Property of nalani83

• 14.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 300 Fuel-ups

  Property of nightrock548

• 17.3 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 89 Fuel-ups

  Property of Along411

• 23.6 Avg MPG

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