Based on data from 82 vehicles, 7,847 fuel-ups and 2,572,405 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 (27) 2.0L L4 GAS (30) Any Body Style Sport Utility (25) Any Submodel Denali (15) SLE (31) SLT (36)

Below you can see a distribution of the fuel-ups with 69 outliers (0.87%) removed.

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

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• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2018 • 383 Fuel-ups

  Property of KBender

• 19.4 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Aug 2021 • 138 Fuel-ups

  Property of etombaugh

• 25.8 Avg MPG

• Trichs Terrain

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

  Property of Hammer46

• 26.7 Avg MPG

• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 245 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 • 242 Fuel-ups

  Property of Cyanide

• 38.6 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 329 Fuel-ups

  Property of bwelsh321

• 34.9 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 206 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 • 292 Fuel-ups

  Property of sarwagwin

• 37.0 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 276 Fuel-ups

  Property of mbergner

• 23.9 Avg MPG

• Dad's Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jun 2019 • 140 Fuel-ups

  Property of HerbTarlek

• 26.6 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 265 Fuel-ups

  Property of nstp97

• 32.2 Avg MPG

• My GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 9 Speed
  Added Mar 2025 • 5 Fuel-ups

  Property of Silfire412

• 36.7 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 103 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 • 214 Fuel-ups

  Property of wrightjd2

• 21.3 Avg MPG

• Chevy Terrain

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

  Property of 8elgoog8

• 27.0 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Feb 2023 • 86 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 • 308 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 • 254 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 • 152 Fuel-ups

  Property of kendiesel85

• 25.3 Avg MPG

• My Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Apr 2019 • 102 Fuel-ups

  Property of superherofedman

• 39.8 Avg MPG

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