Based on data from 79 vehicles, 7,477 fuel-ups and 2,465,357 miles of driving, the 2018 GMC Terrain gets a combined Avg MPG of 28.52 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 (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 (0.56%) removed.

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

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• Grey Ghost

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Sep 2021 • 226 Fuel-ups

  Property of drifter47

• 27.2 Avg MPG

• BlackCloud’s '18 Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2019 • 225 Fuel-ups

  Property of Cyanide

• 38.9 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2020 • 44 Fuel-ups

  Property of Niff42

• 22.0 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Feb 2023 • 74 Fuel-ups

  Property of ChuckP62

• 26.4 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Aug 2021 • 128 Fuel-ups

  Property of etombaugh

• 25.8 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Feb 2018 • 368 Fuel-ups

  Property of KBender

• 19.5 Avg MPG

• Andy&Karens Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Apr 2018 • 243 Fuel-ups

  Property of kandy

• 28.5 Avg MPG

• GMC

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jun 2021 • 193 Fuel-ups

  Property of kamilw

• 36.5 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2021 • 198 Fuel-ups

  Property of wrightjd2

• 21.5 Avg MPG

• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added May 2020 • 134 Fuel-ups

  Property of kendiesel85

• 25.1 Avg MPG

• GMC Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 250 Fuel-ups

  Property of nstp97

• 32.3 Avg MPG

• Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Jul 2021 • 298 Fuel-ups

  Property of bwelsh321

• 35.2 Avg MPG

• 2018 Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Dec 2019 • 278 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 • 211 Fuel-ups

  Property of mark6804

• 21.3 Avg MPG

• Nolan - Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 6 Speed
  Added Aug 2023 • 75 Fuel-ups

  Property of jheinzl

• 19.4 Avg MPG

• My Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Apr 2019 • 100 Fuel-ups

  Property of superherofedman

• 39.8 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 260 Fuel-ups

  Property of mbergner

• 24.0 Avg MPG

• Trichs Terrain

  2018 GMC Terrain SLT 2.0L L4 GAS Automatic 9 Speed
  Added Jun 2018 • 298 Fuel-ups

  Property of Hammer46

• 26.8 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Jul 2018 • 139 Fuel-ups

  Property of allen

• 33.1 Avg MPG

• Dad's Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Jun 2019 • 129 Fuel-ups

  Property of HerbTarlek

• 26.8 Avg MPG

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