Based on data from 192 vehicles, 15,614 fuel-ups and 5,146,558 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 (85) 4.3L V6 GAS (1) 5.3L V8 GAS (52) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (38) SLT (45) AT4 (70)

Below you can see a distribution of the fuel-ups with 350 outliers (2.19%) removed.

Following shows the average MPG of each of the 192 vehicles in the system.

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• 2020 Sierra Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2023 • 63 Fuel-ups

  Property of gksills

• 19.4 Avg MPG

• Sierra 1500

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

  Property of Heatdish

• 24.2 Avg MPG

• Bandit

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2023 • 73 Fuel-ups

  Property of bowden

• 24.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2024 • 14 Fuel-ups

  Property of Jbonebrake

• 23.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 223 Fuel-ups

  Property of Kurrirra

• 15.6 Avg MPG

• 2020 GMC Sierra 1500 Denali

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

  Property of sk83

• 22.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2022 • 58 Fuel-ups

  Property of gcoil

• 23.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 7 Fuel-ups

  Property of Doc31

• 19.4 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2020 • 96 Fuel-ups

  Property of jjuppyh

• 22.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 77 Fuel-ups

  Property of Mazerk

• 24.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 143 Fuel-ups

  Property of SRolfe

• 25.4 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Aug 2020 • 120 Fuel-ups

  Property of juneau76

• 24.7 Avg MPG

• Sierra AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2023 • 69 Fuel-ups

  Property of kdavismt

• 15.2 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2020 • 249 Fuel-ups

  Property of Bowtie76

• 14.4 Avg MPG

• Sierra

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2024 • 57 Fuel-ups

  Property of nick8924

• 15.6 Avg MPG

• 2020 Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 22 Fuel-ups

  Property of dirtymoe77

• 15.1 Avg MPG

• Red Rover

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2020 • 163 Fuel-ups

  Property of wondergeek

• 21.6 Avg MPG

• 2020 GMC AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2023 • 31 Fuel-ups

  Property of Risser

• 24.4 Avg MPG

• My Sierra 1500

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

  Property of protouring

• 22.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2023 • 11 Fuel-ups

  Property of FarmboyFresh100

• 26.7 Avg MPG

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