Based on data from 190 vehicles, 13,886 fuel-ups and 4,586,582 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 (84) 4.3L V6 GAS (1) 5.3L V8 GAS (52) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (34) SLT (44) AT4 (73)

Below you can see a distribution of the fuel-ups with 318 outliers (2.24%) removed.

Following shows the average MPG of each of the 190 vehicles in the system.

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• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2021 • 53 Fuel-ups

  Property of nightstick320

• 19.7 Avg MPG

• Denna

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 90 Fuel-ups

  Property of knightbsandy

• 24.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Oct 2020 • 48 Fuel-ups

  Property of dphillippe

• 20.1 Avg MPG

• 2020 Sierra - Towing

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Aug 2020 • 31 Fuel-ups

  Property of Rexpelagi

• 19.4 Avg MPG

• 2020 GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2020 • 94 Fuel-ups

  Property of blkcheech

• 16.8 Avg MPG

• My Sierra 1500

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

  Property of willyihts

• 23.7 Avg MPG

• Iron

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2020 • 68 Fuel-ups

  Property of andyh1

• 23.8 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 13 Fuel-ups

  Property of Larsan90

• 24.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 54 Fuel-ups

  Property of shawsvale

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 171 Fuel-ups

  Property of ImpRoma

• 18.6 Avg MPG

• Duramax 3.0 on 34’s

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 31 Fuel-ups

  Property of thechadwickk

• 22.5 Avg MPG

• 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

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