Based on data from 82 vehicles, 7,789 fuel-ups and 2,551,265 miles of driving, the 2018 GMC Terrain gets a combined Avg MPG of 28.39 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 (31) Any Body Style Sport Utility (26) Any Submodel Denali (16) SLE (30) SLT (36)

Below you can see a distribution of the fuel-ups with 75 outliers (0.95%) removed.

Following shows the average MPG of each of the 82 vehicles in the system.

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• Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jan 2025 • 137 Fuel-ups

  Property of artman1913

• 27.5 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 270 Fuel-ups

  Property of mbergner

• 23.9 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 260 Fuel-ups

  Property of nstp97

• 32.2 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 320 Fuel-ups

  Property of bwelsh321

• 34.9 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 239 Fuel-ups

  Property of drifter47

• 27.1 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 236 Fuel-ups

  Property of Cyanide

• 38.7 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 92 Fuel-ups

  Property of jheinzl

• 19.2 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2021 • 209 Fuel-ups

  Property of wrightjd2

• 21.3 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 201 Fuel-ups

  Property of kamilw

• 36.4 Avg MPG

• 2018 Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Dec 2019 • 285 Fuel-ups

  Property of sarwagwin

• 37.0 Avg MPG

• Terrain 2018

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Mar 2021 • 223 Fuel-ups

  Property of mark6804

• 21.4 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Feb 2023 • 84 Fuel-ups

  Property of ChuckP62

• 26.4 Avg MPG

• Black Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 302 Fuel-ups

  Property of TerrainTracker

• 32.1 Avg MPG

• Andy&Karens Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Apr 2018 • 251 Fuel-ups

  Property of kandy

• 28.4 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2020 • 145 Fuel-ups

  Property of kendiesel85

• 25.2 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Jan 2018 • 134 Fuel-ups

  Property of FuelCricket

• 23.6 Avg MPG

• Trichs Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Jun 2018 • 307 Fuel-ups

  Property of Hammer46

• 26.7 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2018 • 377 Fuel-ups

  Property of KBender

• 19.5 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 106 Fuel-ups

  Property of red5_5

• 26.8 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Jul 2018 • 143 Fuel-ups

  Property of allen

• 33.2 Avg MPG

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