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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• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 59 Fuel-ups

  Property of sslack1970

• 18.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 299 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2020 • 99 Fuel-ups

  Property of TigerDeAnn

• 18.1 Avg MPG

• GMC 6.2l

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2024 • 12 Fuel-ups

  Property of jscott2126

• 16.3 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 52 Fuel-ups

  Property of ZPAXTON

• 22.1 Avg MPG

• Chuck’s Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2023 • 141 Fuel-ups

  Property of Arcflash96

• 22.7 Avg MPG

• Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 164 Fuel-ups

  Property of mattb5150

• 19.5 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 88 Fuel-ups

  Property of clo004

• 15.3 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2022 • 123 Fuel-ups

  Property of srlew

• 15.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 229 Fuel-ups

  Property of AnglerAT

• 24.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2020 • 156 Fuel-ups

  Property of Griffith

• 23.0 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Crew Cab Pickup
  Added Dec 2023 • 39 Fuel-ups

  Property of cmore

• 17.4 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 26 Fuel-ups

  Property of PNaj

• 19.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Dec 2021 • 118 Fuel-ups

  Property of rudog805

• 18.1 Avg MPG

• Pretty Ass Red Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2020 • 99 Fuel-ups

  Property of BrianK

• 24.7 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 86 Fuel-ups

  Property of Along411

• 23.4 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2022 • 176 Fuel-ups

  Property of AT42020

• 16.9 Avg MPG

• Sierra AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2020 • 125 Fuel-ups

  Property of bgweed

• 15.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 127 Fuel-ups

  Property of elcount

• 24.6 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 97 Fuel-ups

  Property of robertt656

• 18.0 Avg MPG

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