Based on data from 78 vehicles, 6,714 fuel-ups and 2,202,779 miles of driving, the 2018 GMC Terrain gets a combined Avg MPG of 28.39 with a 0.20 MPG margin of error.

Any Engine Type 1.5L L4 GAS (23) 1.6L L4 DIESEL (25) 2.0L L4 GAS (29) Any Body Style Sport Utility (23) Any Submodel Denali (14) SLE (29) SLT (35)

Below you can see a distribution of the fuel-ups with 60 outliers (0.89%) removed.

Following shows the average MPG of each of the 78 vehicles in the system.

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• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Aug 2021 • 102 Fuel-ups

  Property of etombaugh

• 25.6 Avg MPG

• 2018 Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Dec 2019 • 248 Fuel-ups

  Property of sarwagwin

• 37.0 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2020 • 100 Fuel-ups

  Property of kendiesel85

• 24.6 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 187 Fuel-ups

  Property of drifter47

• 27.2 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 36 Fuel-ups

  Property of jheinzl

• 18.7 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 230 Fuel-ups

  Property of nstp97

• 32.3 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 171 Fuel-ups

  Property of kamilw

• 36.8 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 200 Fuel-ups

  Property of Cyanide

• 39.1 Avg MPG

• Dad's Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jun 2019 • 110 Fuel-ups

  Property of HerbTarlek

• 26.7 Avg MPG

• Terrain 2018

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Mar 2021 • 183 Fuel-ups

  Property of mark6804

• 21.3 Avg MPG

• GMC Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Aug 2023 • 33 Fuel-ups

  Property of miked083

• 35.0 Avg MPG

• Black Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 273 Fuel-ups

  Property of TerrainTracker

• 32.4 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 95 Fuel-ups

  Property of red5_5

• 26.8 Avg MPG

• My Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Jul 2022 • 329 Fuel-ups

  Property of darryltaber

• 23.1 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Feb 2023 • 53 Fuel-ups

  Property of ChuckP62

• 26.5 Avg MPG

• Andy&Karens Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Apr 2018 • 217 Fuel-ups

  Property of kandy

• 28.4 Avg MPG

• Trichs Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Jun 2018 • 254 Fuel-ups

  Property of Hammer46

• 26.5 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2021 • 165 Fuel-ups

  Property of wrightjd2

• 21.4 Avg MPG

• Red Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Aug 2022 • 74 Fuel-ups

  Property of chrishuntfish2

• 25.6 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 255 Fuel-ups

  Property of bwelsh321

• 35.1 Avg MPG

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