Based on data from 81 vehicles, 7,767 fuel-ups and 2,543,607 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 (23) 1.6L L4 DIESEL (26) 2.0L L4 GAS (31) Any Body Style Sport Utility (25) Any Submodel Denali (16) SLE (29) SLT (36)

Below you can see a distribution of the fuel-ups with 74 outliers (0.94%) removed.

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

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• 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

• 2018 Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Dec 2019 • 284 Fuel-ups

  Property of sarwagwin

• 37.0 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 90 Fuel-ups

  Property of jheinzl

• 19.2 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

• GMC Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Feb 2023 • 82 Fuel-ups

  Property of ChuckP62

• 26.4 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 235 Fuel-ups

  Property of Cyanide

• 38.7 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 269 Fuel-ups

  Property of mbergner

• 23.9 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

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 259 Fuel-ups

  Property of nstp97

• 32.2 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 200 Fuel-ups

  Property of kamilw

• 36.4 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 314 Fuel-ups

  Property of bwelsh321

• 35.0 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2021 • 207 Fuel-ups

  Property of wrightjd2

• 21.3 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

• Terrain 2018

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Mar 2021 • 222 Fuel-ups

  Property of mark6804

• 21.4 Avg MPG

• Black Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 301 Fuel-ups

  Property of TerrainTracker

• 32.2 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 238 Fuel-ups

  Property of drifter47

• 27.2 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Aug 2021 • 134 Fuel-ups

  Property of etombaugh

• 25.8 Avg MPG

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