Based on data from 81 vehicles, 7,791 fuel-ups and 2,553,748 miles of driving, the 2018 GMC Terrain gets a combined Avg MPG of 28.41 with a 0.19 MPG margin of error.

Any Engine Type 1.5L L4 GAS (24) 1.6L L4 DIESEL (26) 2.0L L4 GAS (30) Any Body Style Sport Utility (25) Any Submodel Denali (15) SLE (30) SLT (36)

Below you can see a distribution of the fuel-ups with 69 outliers (0.88%) removed.

Following shows the average MPG of each of the 81 vehicles in the system.

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• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 100 Fuel-ups

  Property of jheinzl

• 19.2 Avg MPG

• Black Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 304 Fuel-ups

  Property of TerrainTracker

• 32.1 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2020 • 150 Fuel-ups

  Property of kendiesel85

• 25.2 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2021 • 212 Fuel-ups

  Property of wrightjd2

• 21.3 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 240 Fuel-ups

  Property of Cyanide

• 38.6 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 263 Fuel-ups

  Property of nstp97

• 32.2 Avg MPG

• 2018 Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Dec 2019 • 289 Fuel-ups

  Property of sarwagwin

• 37.0 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 324 Fuel-ups

  Property of bwelsh321

• 34.9 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 203 Fuel-ups

  Property of kamilw

• 36.4 Avg MPG

• Andy&Karens Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Apr 2018 • 253 Fuel-ups

  Property of kandy

• 28.4 Avg MPG

• Terrain 2018

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Mar 2021 • 226 Fuel-ups

  Property of mark6804

• 21.4 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2018 • 380 Fuel-ups

  Property of KBender

• 19.5 Avg MPG

• Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jan 2025 • 150 Fuel-ups

  Property of artman1913

• 27.6 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 242 Fuel-ups

  Property of drifter47

• 27.1 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 272 Fuel-ups

  Property of mbergner

• 23.9 Avg MPG

• Trichs Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Jun 2018 • 309 Fuel-ups

  Property of Hammer46

• 26.7 Avg MPG

• Dad's Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jun 2019 • 137 Fuel-ups

  Property of HerbTarlek

• 26.6 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Feb 2023 • 85 Fuel-ups

  Property of ChuckP62

• 26.4 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2020 • 47 Fuel-ups

  Property of Niff42

• 21.9 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Jul 2018 • 145 Fuel-ups

  Property of allen

• 33.2 Avg MPG

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