Based on data from 39 vehicles, 3,238 fuel-ups and 859,075 miles of driving, the 2020 GMC Terrain gets a combined Avg MPG of 24.33 with a 0.15 MPG margin of error.

Any Engine Type 1.5L L4 GAS (22) 2.0L L4 GAS (14) Any Body Style Sport Utility (15) Any Submodel Denali (5) SLE (12) SLT (22)

Below you can see a distribution of the fuel-ups with 66 outliers (2.00%) removed.

Following shows the average MPG of each of the 39 vehicles in the system.

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• Terrain

  2020 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed Sport Utility
  Added May 2025 • 4 Fuel-ups

  Property of ekj9905

• 26.7 Avg MPG

• 20 Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed Sport Utility
  Added Aug 2024 • 138 Fuel-ups

  Property of PicheNDX

• 29.7 Avg MPG

• 2020 Terrain

  2020 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Jun 2021 • 241 Fuel-ups

  Property of bjames69firebird

• 26.7 Avg MPG

• GMC Terrain SLT

  2020 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Nov 2020 • 357 Fuel-ups

  Property of Arik74

• 22.0 Avg MPG

• My Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed
  Added May 2024 • 41 Fuel-ups

  Property of sarahkirkwills

• 24.6 Avg MPG

• Terrain

  2020 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Jul 2024 • 39 Fuel-ups

  Property of jonathanivan

• 22.1 Avg MPG

• 2020 GMC Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed Sport Utility
  Added Jul 2020 • 289 Fuel-ups

  Property of fredgannon

• 25.5 Avg MPG

• My Terrain

  2020 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added May 2024 • 7 Fuel-ups

  Property of brettbeggs

• 28.2 Avg MPG

• 2020 GMC Terrain

  2020 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Apr 2021 • 159 Fuel-ups

  Property of dlav_ca

• 23.3 Avg MPG

• My Terrain

  2020 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2025 • 15 Fuel-ups

  Property of monahan20

• 23.2 Avg MPG

• Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed Sport Utility
  Added Feb 2020 • 168 Fuel-ups

  Property of dmarbes

• 26.5 Avg MPG

• My Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed
  Added Aug 2020 • 129 Fuel-ups

  Property of JessicaMarie

• 20.6 Avg MPG

• 2020 Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2020 • 150 Fuel-ups

  Property of Wrench01

• 27.8 Avg MPG

• My Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed
  Added Mar 2020 • 139 Fuel-ups

  Property of trains2007

• 25.4 Avg MPG

• My Terrain

  2020 GMC Terrain SLT
  Added Jan 2020 • 67 Fuel-ups

  Property of wrjsn

• 24.8 Avg MPG

• Terrain

  2020 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jan 2020 • 12 Fuel-ups

  Property of jones715

• 19.5 Avg MPG

• My Terrain

  2020 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Jan 2025 • 4 Fuel-ups

  Property of gmweber91

• 35.4 Avg MPG

• Terrain

  2020 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Oct 2021 • 18 Fuel-ups

  Property of slugro

• 23.8 Avg MPG

• My Terrain

  2020 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Aug 2024 • 20 Fuel-ups

  Property of Tcbrown11

• 24.5 Avg MPG

• My Terrain

  2020 GMC Terrain SLT 1.5L L4 GAS Automatic 9 Speed
  Added Jun 2020 • 143 Fuel-ups

  Property of phillyturbosix

• 24.9 Avg MPG

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