Based on data from 153 vehicles, 7,705 fuel-ups and 2,628,139 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.66 with a 0.12 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (72) 4.3L V6 GAS (1) 5.3L V8 GAS (36) 6.2L V8 GAS (32) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (34) Any Submodel Base (2) SLE (10) Elevation (25) Denali (26) SLT (33) AT4 (57)

Below you can see a distribution of the fuel-ups with 59 outliers (0.76%) removed.

Following shows the average MPG of each of the 153 vehicles in the system.

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• Crimson Ride

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2020 • 75 Fuel-ups

  Property of texbama

• 21.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 99 Fuel-ups

  Property of AnglerAT

• 25.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 32 Fuel-ups

  Property of Davecaps

• 19.2 Avg MPG

• Big Gray

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2020 • 61 Fuel-ups

  Property of wirowek

• 23.2 Avg MPG

• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 53 Fuel-ups

  Property of jhhaney97

• 23.2 Avg MPG

• Duramax

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

  Property of mattb5150

• 20.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 96 Fuel-ups

  Property of mbnereim

• 16.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 67 Fuel-ups

  Property of jessemfa

• 22.4 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2020 • 55 Fuel-ups

  Property of jjuppyh

• 23.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Apr 2020 • 60 Fuel-ups

  Property of Qbert

• 16.4 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2020 • 63 Fuel-ups

  Property of Bensontbjj1

• 17.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 153 Fuel-ups

  Property of ImpRoma

• 18.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 63 Fuel-ups

  Property of crggmc

• 14.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 120 Fuel-ups

  Property of Bowtie76

• 14.8 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 35 Fuel-ups

  Property of rmsevo

• 21.5 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 92 Fuel-ups

  Property of ItsMine

• 25.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 11 Fuel-ups

  Property of JMcCabe

• 18.6 Avg MPG

• The Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 65 Fuel-ups

  Property of Mijo123

• 21.9 Avg MPG

• 2020 GMC Sierra 1500 Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2020 • 58 Fuel-ups

  Property of sk83

• 22.9 Avg MPG

• 2020 Sierra - Towing

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

  Property of Rexpelagi

• 19.7 Avg MPG

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