Based on data from 80 vehicles, 7,564 fuel-ups and 2,492,090 miles of driving, the 2018 GMC Terrain gets a combined Avg MPG of 28.50 with a 0.19 MPG margin of error.

Any Engine Type 1.5L L4 GAS (23) 1.6L L4 DIESEL (26) 2.0L L4 GAS (30) Any Body Style Sport Utility (24) Any Submodel Denali (15) SLE (29) SLT (36)

Below you can see a distribution of the fuel-ups with 42 outliers (0.55%) removed.

Following shows the average MPG of each of the 80 vehicles in the system.

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• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 254 Fuel-ups

  Property of nstp97

• 32.3 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2018 • 372 Fuel-ups

  Property of KBender

• 19.5 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Aug 2021 • 133 Fuel-ups

  Property of etombaugh

• 25.8 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 305 Fuel-ups

  Property of bwelsh321

• 35.1 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2020 • 139 Fuel-ups

  Property of kendiesel85

• 25.2 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 82 Fuel-ups

  Property of jheinzl

• 19.4 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 196 Fuel-ups

  Property of kamilw

• 36.5 Avg MPG

• Terrain 2018

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Mar 2021 • 215 Fuel-ups

  Property of mark6804

• 21.3 Avg MPG

• GMC Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Aug 2024 • 4 Fuel-ups

  Property of DinoUser

• 26.5 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 265 Fuel-ups

  Property of mbergner

• 23.9 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2021 • 202 Fuel-ups

  Property of wrightjd2

• 21.4 Avg MPG

• Black Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 294 Fuel-ups

  Property of TerrainTracker

• 32.3 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 231 Fuel-ups

  Property of drifter47

• 27.2 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Jan 2018 • 132 Fuel-ups

  Property of FuelCricket

• 23.7 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Feb 2023 • 77 Fuel-ups

  Property of ChuckP62

• 26.3 Avg MPG

• Trichs Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Jun 2018 • 303 Fuel-ups

  Property of Hammer46

• 26.8 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 229 Fuel-ups

  Property of Cyanide

• 38.8 Avg MPG

• Dad's Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jun 2019 • 132 Fuel-ups

  Property of HerbTarlek

• 26.8 Avg MPG

• Andy&Karens Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Apr 2018 • 246 Fuel-ups

  Property of kandy

• 28.5 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2020 • 45 Fuel-ups

  Property of Niff42

• 22.0 Avg MPG

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