Based on data from 192 vehicles, 15,614 fuel-ups and 5,146,558 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 (85) 4.3L V6 GAS (1) 5.3L V8 GAS (52) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (38) SLT (45) AT4 (70)

Below you can see a distribution of the fuel-ups with 350 outliers (2.19%) removed.

Following shows the average MPG of each of the 192 vehicles in the system.

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• Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 263 Fuel-ups

  Property of Boatman744

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2024 • 9 Fuel-ups

  Property of coreywgrant

• 24.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 2.7L L4 GAS Automatic 6 Speed
  Added Apr 2023 • 40 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 Sep 2020 • 236 Fuel-ups

  Property of mbnereim

• 16.4 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 74 Fuel-ups

  Property of MunsonedForLife

• 27.2 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 189 Fuel-ups

  Property of bmrohrer

• 15.1 Avg MPG

• AT4

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

  Property of rmsevo

• 21.0 Avg MPG

• Truck

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 9 Speed Extended Cab Pickup
  Added Aug 2020 • 206 Fuel-ups

  Property of Bw1881

• 14.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 94 Fuel-ups

  Property of eizan70

• 15.8 Avg MPG

• My Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 215 Fuel-ups

  Property of SEH22

• 18.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 129 Fuel-ups

  Property of stuart1943

• 16.1 Avg MPG

• My Sierra 1500

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

  Property of Bigredcherokee

• 15.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 13 Fuel-ups

  Property of salexshirk

• 17.3 Avg MPG

• Blanca

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2017 • 45 Fuel-ups

  Property of adolrn

• 18.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 135 Fuel-ups

  Property of jtabor

• 16.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 101 Fuel-ups

  Property of A-Aron6

• 17.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 255 Fuel-ups

  Property of mjp1850

• 14.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 216 Fuel-ups

  Property of bmh4301

• 13.5 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 248 Fuel-ups

  Property of mcsgary

• 18.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 205 Fuel-ups

  Property of JettaFuelMileage

• 15.3 Avg MPG

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