Based on data from 190 vehicles, 13,812 fuel-ups and 4,560,731 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.22 with a 0.09 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 (2.25%) removed.

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

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• Truck

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 9 Speed Extended Cab Pickup
  Added Aug 2020 • 180 Fuel-ups

  Property of Bw1881

• 14.8 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 141 Fuel-ups

  Property of jndelisl

• 17.4 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 26 Fuel-ups

  Property of ZPAXTON

• 22.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 2.7L L4 GAS Automatic 6 Speed
  Added Apr 2023 • 25 Fuel-ups

  Property of Stenwood

• 19.5 Avg MPG

• Blanca

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2017 • 8 Fuel-ups

  Property of adolrn

• 16.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 265 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 149 Fuel-ups

  Property of surfintx2004

• 20.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2020 • 123 Fuel-ups

  Property of brianjadams

• 14.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 110 Fuel-ups

  Property of elcount

• 24.5 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Dec 2021 • 92 Fuel-ups

  Property of rudog805

• 18.3 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 216 Fuel-ups

  Property of msteiner17

• 17.0 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 156 Fuel-ups

  Property of msova2

• 15.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 199 Fuel-ups

  Property of AnglerAT

• 25.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 77 Fuel-ups

  Property of A-Aron6

• 16.8 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

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 246 Fuel-ups

  Property of nightrock548

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 5 Fuel-ups

  Property of Doc31

• 18.3 Avg MPG

• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 110 Fuel-ups

  Property of jhhaney97

• 23.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 88 Fuel-ups

  Property of stuart1943

• 15.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 73 Fuel-ups

  Property of weedtrucker

• 25.1 Avg MPG

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