Based on data from 82 vehicles, 8,289 fuel-ups and 2,733,672 miles of driving, the 2018 GMC Terrain gets a combined Avg MPG of 28.52 with a 0.18 MPG margin of error.

Any Engine Type 1.5L L4 GAS (24) 1.6L L4 DIESEL (27) 2.0L L4 GAS (30) Any Body Style Sport Utility (24) Any Submodel Denali (15) SLE (31) SLT (36)

Below you can see a distribution of the fuel-ups with 48 outliers (0.58%) removed.

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

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• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2020 • 65 Fuel-ups

  Property of Niff42

• 22.3 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 231 Fuel-ups

  Property of kamilw

• 36.3 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 380 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 • 240 Fuel-ups

  Property of wrightjd2

• 21.3 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2020 • 184 Fuel-ups

  Property of kendiesel85

• 25.5 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 273 Fuel-ups

  Property of drifter47

• 27.2 Avg MPG

• Chevy Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed Sport Utility
  Added Nov 2024 • 16 Fuel-ups

  Property of 8elgoog8

• 41.5 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 287 Fuel-ups

  Property of nstp97

• 32.1 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 141 Fuel-ups

  Property of jheinzl

• 19.3 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 313 Fuel-ups

  Property of mbergner

• 24.1 Avg MPG

• Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jan 2025 • 161 Fuel-ups

  Property of artman1913

• 27.3 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 268 Fuel-ups

  Property of Cyanide

• 38.8 Avg MPG

• Terrain 2018

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Mar 2021 • 259 Fuel-ups

  Property of mark6804

• 21.3 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2018 • 409 Fuel-ups

  Property of KBender

• 19.4 Avg MPG

• 2018 Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Dec 2019 • 319 Fuel-ups

  Property of sarwagwin

• 36.9 Avg MPG

• Andy&Karens Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Apr 2018 • 267 Fuel-ups

  Property of kandy

• 28.4 Avg MPG

• My GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 9 Speed
  Added Mar 2025 • 24 Fuel-ups

  Property of Silfire412

• 37.5 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Aug 2021 • 157 Fuel-ups

  Property of etombaugh

• 25.8 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 119 Fuel-ups

  Property of red5_5

• 27.1 Avg MPG

• Trichs Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Jun 2018 • 345 Fuel-ups

  Property of Hammer46

• 26.8 Avg MPG

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