Based on data from 79 vehicles, 6,853 fuel-ups and 2,260,405 miles of driving, the 2018 GMC Terrain gets a combined Avg MPG of 28.52 with a 0.20 MPG margin of error.

Any Engine Type 1.5L L4 GAS (23) 1.6L L4 DIESEL (26) 2.0L L4 GAS (29) Any Body Style Sport Utility (24) Any Submodel Denali (14) SLE (29) SLT (36)

Below you can see a distribution of the fuel-ups with 42 outliers (0.61%) removed.

Following shows the average MPG of each of the 79 vehicles in the system.

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• My Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Jul 2022 • 333 Fuel-ups

  Property of darryltaber

• 23.1 Avg MPG

• Dad's Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jun 2019 • 111 Fuel-ups

  Property of HerbTarlek

• 26.7 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2020 • 29 Fuel-ups

  Property of Niff42

• 21.4 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 231 Fuel-ups

  Property of nstp97

• 32.3 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 201 Fuel-ups

  Property of Cyanide

• 39.1 Avg MPG

• Andy&Karens Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Apr 2018 • 218 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 • 255 Fuel-ups

  Property of Hammer46

• 26.5 Avg MPG

• Black Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 274 Fuel-ups

  Property of TerrainTracker

• 32.4 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 188 Fuel-ups

  Property of drifter47

• 27.1 Avg MPG

• 2018 Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Dec 2019 • 249 Fuel-ups

  Property of sarwagwin

• 37.0 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 172 Fuel-ups

  Property of kamilw

• 36.7 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 256 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 • 101 Fuel-ups

  Property of kendiesel85

• 24.6 Avg MPG

• Terrain 2018

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Mar 2021 • 184 Fuel-ups

  Property of mark6804

• 21.2 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 225 Fuel-ups

  Property of mbergner

• 23.7 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 37 Fuel-ups

  Property of jheinzl

• 18.7 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Jan 2018 • 121 Fuel-ups

  Property of FuelCricket

• 23.7 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2021 • 166 Fuel-ups

  Property of wrightjd2

• 21.4 Avg MPG

• GMC Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Aug 2023 • 34 Fuel-ups

  Property of miked083

• 35.2 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2018 • 337 Fuel-ups

  Property of KBender

• 19.6 Avg MPG

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