Based on data from 192 vehicles, 15,612 fuel-ups and 5,146,299 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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• Sierra

  2020 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 221 Fuel-ups

  Property of nalani83

• 14.9 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

• 2020 Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2020 • 134 Fuel-ups

  Property of jhhaney97

• 23.8 Avg MPG

• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 423 Fuel-ups

  Property of bdenman

• 19.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 169 Fuel-ups

  Property of mcginnmf16

• 15.2 Avg MPG

• Leonardo Denali

  2020 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2023 • 82 Fuel-ups

  Property of Bippin

• 15.1 Avg MPG

• GMC Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2020 • 187 Fuel-ups

  Property of Knoname

• 20.1 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2020 • 208 Fuel-ups

  Property of JW46

• 16.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2020 • 145 Fuel-ups

  Property of brianjadams

• 14.9 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 178 Fuel-ups

  Property of msova2

• 15.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2023 • 123 Fuel-ups

  Property of jwbraam3

• 16.3 Avg MPG

• Sierra 1500 AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 245 Fuel-ups

  Property of msteiner17

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 89 Fuel-ups

  Property of weedtrucker

• 25.3 Avg MPG

• My Sierra 1500

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

  Property of tylerbell

• 16.9 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 292 Fuel-ups

  Property of nightrock548

• 17.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 174 Fuel-ups

  Property of surfintx2004

• 19.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2022 • 128 Fuel-ups

  Property of nicktcr

• 19.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 54 Fuel-ups

  Property of roadwarrior51

• 17.8 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 171 Fuel-ups

  Property of riefej80

• 19.9 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 217 Fuel-ups

  Property of ItsMine

• 24.0 Avg MPG

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