Based on data from 198 vehicles, 15,957 fuel-ups and 5,261,866 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 (89) 4.3L V6 GAS (1) 5.3L V8 GAS (55) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (50) Any Submodel Base (3) SLE (10) Elevation (29) Denali (39) SLT (45) AT4 (72)

Below you can see a distribution of the fuel-ups with 358 outliers (2.19%) 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 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 12 Fuel-ups

  Property of JMcCabe

• 19.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 55 Fuel-ups

  Property of Nailer18

• 22.4 Avg MPG

• Sierra SLT

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 40 Fuel-ups

  Property of PtownVdub

• 22.3 Avg MPG

• 2020 GMC

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2020 • 70 Fuel-ups

  Property of garretn

• 18.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2020 • 39 Fuel-ups

  Property of TheCrazyLudwig

• 24.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Feb 2022 • 5 Fuel-ups

  Property of robbycruz52

• 19.1 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 199 Fuel-ups

  Property of Greytauer

• 18.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2022 • 7 Fuel-ups

  Property of stab

• 23.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 68 Fuel-ups

  Property of 69Redbird

• 14.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 23 Fuel-ups

  Property of Hornstar

• 25.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 68 Fuel-ups

  Property of Wittfam4

• 21.3 Avg MPG

• Ryan's Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 39 Fuel-ups

  Property of rademarco03

• 22.0 Avg MPG

• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2023 • 29 Fuel-ups

  Property of htr4

• 22.1 Avg MPG

• Storm Trooper

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 53 Fuel-ups

  Property of seans

• 23.5 Avg MPG

• Denaliya

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

  Property of gr8almty1

• 21.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2020 • 46 Fuel-ups

  Property of gswartz

• 25.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 4 Fuel-ups

  Property of AP33

• 21.4 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 81 Fuel-ups

  Property of Tigeraaron

• 23.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2020 • 37 Fuel-ups

  Property of sickdiesel

• 16.1 Avg MPG

• Duramax 3.0

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2020 • 45 Fuel-ups

  Property of 2020DuramaxLM2

• 25.8 Avg MPG

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