Based on data from 192 vehicles, 15,664 fuel-ups and 5,162,298 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.21 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 351 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 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 129 Fuel-ups

  Property of nicktcr

• 19.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 170 Fuel-ups

  Property of mcginnmf16

• 15.2 Avg MPG

• GMC 6.2l

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2024 • 13 Fuel-ups

  Property of jscott2126

• 16.1 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 99 Fuel-ups

  Property of robertt656

• 18.0 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 170 Fuel-ups

  Property of jndelisl

• 17.2 Avg MPG

• Leonardo Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 83 Fuel-ups

  Property of Bippin

• 15.0 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 132 Fuel-ups

  Property of AbnZoomie

• 15.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2024 • 32 Fuel-ups

  Property of Bigredcherokee

• 15.5 Avg MPG

• HUNK

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 97 Fuel-ups

  Property of Smokeetr

• 18.9 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 87 Fuel-ups

  Property of Along411

• 23.4 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 246 Fuel-ups

  Property of msteiner17

• 17.0 Avg MPG

• My Denali

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

  Property of SEH22

• 18.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 130 Fuel-ups

  Property of stuart1943

• 16.1 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 188 Fuel-ups

  Property of Knoname

• 20.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2022 • 102 Fuel-ups

  Property of A-Aron6

• 17.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2023 • 95 Fuel-ups

  Property of eizan70

• 15.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 14 Fuel-ups

  Property of salexshirk

• 17.3 Avg MPG

• Sierra

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2020 • 157 Fuel-ups

  Property of Griffith

• 23.0 Avg MPG

• Blanca

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2017 • 46 Fuel-ups

  Property of adolrn

• 18.1 Avg MPG

• 2020 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2023 • 53 Fuel-ups

  Property of ZPAXTON

• 22.1 Avg MPG

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