Based on data from 57 vehicles, 4,085 fuel-ups and 1,205,980 miles of driving, the 2015 GMC Terrain gets a combined Avg MPG of 21.20 with a 0.12 MPG margin of error.

Any Engine Type 2.4L L4 FLEX (10) 2.4L L4 GAS (28) 3.6L V6 FLEX (2) 3.6L V6 GAS (14) Any Body Style Sedan (1) Sport Utility (12) Any Submodel SL (3) Denali (4) SLT (15) SLE (35)

Below you can see a distribution of the fuel-ups with 97 outliers (2.32%) removed.

Following shows the average MPG of each of the 57 vehicles in the system.

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• My Terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Sep 2023 • 20 Fuel-ups

  Property of kay8989

• 58.2 Avg MPG

• Kelsey's Baby Truck 2.0

  2015 GMC Terrain SLT 2.4L L4 GAS Automatic 6 Speed
  Added May 2017 • 389 Fuel-ups

  Property of Kaszmann

• 22.3 Avg MPG

• Terrain

  2015 GMC Terrain SLT 2.4L L4 FLEX Automatic 6 Speed
  Added Dec 2015 • 425 Fuel-ups

  Property of rgill429

• 18.0 Avg MPG

• Terran

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Oct 2023 • 20 Fuel-ups

  Property of FrozenFire

• 17.8 Avg MPG

• White Terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Jul 2023 • 27 Fuel-ups

  Property of 2009Terrain

• 20.5 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 3.6L V6 GAS Automatic 6 Speed
  Added Aug 2019 • 141 Fuel-ups

  Property of TMO65

• 18.3 Avg MPG

• Red

  2015 GMC Terrain SLT 2.4L L4 GAS Automatic 6 Speed
  Added Mar 2018 • 117 Fuel-ups

  Property of mouldman

• 22.7 Avg MPG

• Terrain

  2015 GMC Terrain SLT 2.4L L4 GAS Automatic 6 Speed
  Added Dec 2023 • 7 Fuel-ups

  Property of Amark5933

• 21.5 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added Jul 2018 • 283 Fuel-ups

  Property of MelMurtle

• 23.0 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added Mar 2023 • 30 Fuel-ups

  Property of jpeeps

• 21.5 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 3.6L V6 GAS Automatic 6 Speed
  Added Mar 2017 • 14 Fuel-ups

  Property of mgoblue94

• 61.1 Avg MPG

• Terrain

  2015 GMC Terrain Denali 3.6L V6 FLEX Automatic 6 Speed Sport Utility
  Added Dec 2018 • 569 Fuel-ups

  Property of jdebner

• 21.3 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added May 2018 • 45 Fuel-ups

  Property of keyates

• 23.3 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added Aug 2020 • 152 Fuel-ups

  Property of keyates629

• 23.8 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 2.4L L4 FLEX Automatic 6 Speed
  Added Feb 2022 • 28 Fuel-ups

  Property of tdsmith

• 20.0 Avg MPG

• Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed Sport Utility
  Added Jan 2019 • 35 Fuel-ups

  Property of h46crewchf

• 37.7 Avg MPG

• Terrain

  2015 GMC Terrain SLE 3.6L V6 GAS Automatic 6 Speed Sport Utility
  Added May 2021 • 29 Fuel-ups

  Property of DeeGeorge

• 40.8 Avg MPG

• Silver Sky

  2015 GMC Terrain SL 2.4L L4 GAS Automatic 5 Speed Sport Utility
  Added May 2015 • 119 Fuel-ups

  Property of Lonestar4X4

• 22.8 Avg MPG

• 2015 GMC Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed Sport Utility
  Added Nov 2020 • 52 Fuel-ups

  Property of ehjorten

• 17.6 Avg MPG

• GMC Terrain

  2015 GMC Terrain SLE 2.4L L4 FLEX Automatic 6 Speed
  Added Jul 2017 • 197 Fuel-ups

  Property of rickwhaas

• 22.4 Avg MPG

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