Based on data from 194 vehicles, 15,742 fuel-ups and 5,194,125 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 (86) 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 (49) Any Submodel Base (3) SLE (10) Elevation (26) Denali (38) SLT (45) AT4 (72)

Below you can see a distribution of the fuel-ups with 350 outliers (2.17%) removed.

Following shows the average MPG of each of the 194 vehicles in the system.

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• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 234 Fuel-ups

  Property of AnglerAT

• 24.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 305 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 131 Fuel-ups

  Property of elcount

• 24.6 Avg MPG

• The Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 139 Fuel-ups

  Property of Mijo123

• 20.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 176 Fuel-ups

  Property of mcginnmf16

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 209 Fuel-ups

  Property of JettaFuelMileage

• 15.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 139 Fuel-ups

  Property of nicktcr

• 19.3 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 194 Fuel-ups

  Property of bmrohrer

• 15.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Dec 2021 • 123 Fuel-ups

  Property of rudog805

• 18.1 Avg MPG

• Sierra Denali 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Jul 2023 • 21 Fuel-ups

  Property of kcazatk_1

• 24.8 Avg MPG

• Crimson Ride

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2020 • 168 Fuel-ups

  Property of texbama

• 21.1 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 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2024 • 13 Fuel-ups

  Property of coreywgrant

• 23.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 107 Fuel-ups

  Property of TigerDeAnn

• 18.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 65 Fuel-ups

  Property of sslack1970

• 18.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 100 Fuel-ups

  Property of eizan70

• 15.9 Avg MPG

• Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 226 Fuel-ups

  Property of pinkdream

• 16.3 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2022 • 182 Fuel-ups

  Property of AT42020

• 16.8 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 431 Fuel-ups

  Property of bdenman

• 19.1 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 174 Fuel-ups

  Property of jndelisl

• 17.3 Avg MPG

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