Based on data from 198 vehicles, 15,942 fuel-ups and 5,260,941 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 360 outliers (2.21%) 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 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2024 • 19 Fuel-ups

  Property of coreywgrant

• 23.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 212 Fuel-ups

  Property of JettaFuelMileage

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 149 Fuel-ups

  Property of nicktcr

• 19.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 231 Fuel-ups

  Property of bmh4301

• 13.5 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 261 Fuel-ups

  Property of msteiner17

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 102 Fuel-ups

  Property of rbennett011

• 14.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 238 Fuel-ups

  Property of AnglerAT

• 24.8 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 235 Fuel-ups

  Property of nalani83

• 15.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 114 Fuel-ups

  Property of eizan70

• 16.1 Avg MPG

• Sierra AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Dec 2024 • 15 Fuel-ups

  Property of EMWill

• 15.7 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 • 103 Fuel-ups

  Property of BrianK

• 24.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2024 • 42 Fuel-ups

  Property of Bigredcherokee

• 15.1 Avg MPG

• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 139 Fuel-ups

  Property of jhhaney97

• 23.7 Avg MPG

• Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 20 Fuel-ups

  Property of clayjohnson

• 22.2 Avg MPG

• GMC

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 89 Fuel-ups

  Property of MunsonedForLife

• 26.1 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2025 • 4 Fuel-ups

  Property of JSLitke

• 12.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 281 Fuel-ups

  Property of mjp1850

• 14.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 315 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 109 Fuel-ups

  Property of A-Aron6

• 16.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 136 Fuel-ups

  Property of elcount

• 24.5 Avg MPG

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