Based on data from 190 vehicles, 13,874 fuel-ups and 4,581,660 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 319 outliers (2.25%) removed.

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

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• Grandpa’s Bigger Rig

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2024 • 3 Fuel-ups

  Property of FredWilliam

• 25.6 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2020 • 93 Fuel-ups

  Property of jjuppyh

• 22.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 76 Fuel-ups

  Property of Mazerk

• 24.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 118 Fuel-ups

  Property of crggmc

• 15.1 Avg MPG

• 2020 Truck

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

  Property of rdruster

• 23.3 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 78 Fuel-ups

  Property of robertt656

• 18.1 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 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 77 Fuel-ups

  Property of clo004

• 15.2 Avg MPG

• Crimson Ride

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2020 • 136 Fuel-ups

  Property of texbama

• 21.2 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

• Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2020 • 54 Fuel-ups

  Property of Heatdish

• 24.3 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2022 • 107 Fuel-ups

  Property of srlew

• 15.5 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

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 88 Fuel-ups

  Property of TigerDeAnn

• 18.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2020 • 229 Fuel-ups

  Property of vnatalizio

• 22.0 Avg MPG

• ACK GMC 1500 SIERRA

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 170 Fuel-ups

  Property of ack17

• 17.2 Avg MPG

• Gmc

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 217 Fuel-ups

  Property of Rustyg23

• 18.4 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2023 • 7 Fuel-ups

  Property of DarrylBarton

• 23.7 Avg MPG

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