Based on data from 79 vehicles, 7,480 fuel-ups and 2,466,036 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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• My Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Jan 2018 • 130 Fuel-ups

  Property of FuelCricket

• 23.7 Avg MPG

• 2018 GMC Terrain Denali

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed
  Added Nov 2017 • 265 Fuel-ups

  Property of Dusty-34063

• 27.4 Avg MPG

• Black Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 288 Fuel-ups

  Property of TerrainTracker

• 32.3 Avg MPG

• Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Dec 2017 • 102 Fuel-ups

  Property of red5_5

• 26.9 Avg MPG

• My Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added Jul 2022 • 402 Fuel-ups

  Property of darryltaber

• 23.4 Avg MPG

• Tank

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

  Property of Coralreef

• 36.6 Avg MPG

• GMC Terrain Diesel

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Aug 2023 • 57 Fuel-ups

  Property of miked083

• 35.5 Avg MPG

• Red Terrain

  2018 GMC Terrain SLE 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Aug 2022 • 74 Fuel-ups

  Property of chrishuntfish2

• 25.6 Avg MPG

• Gmc Terrian

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 249 Fuel-ups

  Property of cjp_8476

• 33.9 Avg MPG

• Miley

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Apr 2024 • 107 Fuel-ups

  Property of johnsdog

• 35.4 Avg MPG

• GMC Terrain Denali

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Feb 2021 • 108 Fuel-ups

  Property of nlatkinson

• 19.6 Avg MPG

• Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Nov 2021 • 79 Fuel-ups

  Property of artman1913

• 27.3 Avg MPG

• Terrain

  2018 GMC Terrain Denali 2.0L L4 GAS Automatic 9 Speed Sport Utility
  Added Feb 2023 • 4 Fuel-ups

  Property of vincent1959

• 37.1 Avg MPG

• Storm Breaker

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added May 2018 • 229 Fuel-ups

  Property of BayMan25

• 30.6 Avg MPG

• Diesel Terrain

  2018 GMC Terrain SLT 1.6L L4 DIESEL Automatic 6 Speed
  Added Nov 2019 • 168 Fuel-ups

  Property of blkterrain

• 37.6 Avg MPG

• My Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 9 Speed
  Added Oct 2022 • 53 Fuel-ups

  Property of Mike7777

• 24.6 Avg MPG

• My Terrain

  2018 GMC Terrain SLT 1.5L L4 GAS Automatic 6 Speed
  Added Oct 2022 • 4 Fuel-ups

  Property of us_ct_tc

• 24.4 Avg MPG

• 2018 Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed Sport Utility
  Added Feb 2022 • 12 Fuel-ups

  Property of Rworen

• 24.5 Avg MPG

• My Terrain

  2018 GMC Terrain SLE 1.5L L4 GAS Automatic 6 Speed
  Added May 2019 • 14 Fuel-ups

  Property of msshowler

• 21.9 Avg MPG

• GT2018

  2018 GMC Terrain SLE 1.6L L4 DIESEL Automatic 6 Speed Sport Utility
  Added Aug 2018 • 48 Fuel-ups

  Property of gain74

• 28.5 Avg MPG

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