Based on data from 59 vehicles, 4,343 fuel-ups and 1,277,966 miles of driving, the 2015 GMC Terrain gets a combined Avg MPG of 21.09 with a 0.12 MPG margin of error.

Any Engine Type 2.4L L4 FLEX (11) 2.4L L4 GAS (27) 3.6L V6 FLEX (2) 3.6L V6 GAS (15) Any Body Style Sedan (1) Sport Utility (12) Any Submodel SL (3) Denali (5) SLT (17) SLE (34)

Below you can see a distribution of the fuel-ups with 120 outliers (2.69%) removed.

Following shows the average MPG of each of the 59 vehicles in the system.

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• White Terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Jul 2023 • 86 Fuel-ups

  Property of 2009Terrain

• 21.7 Avg MPG

• Terrain

  2015 GMC Terrain SLT 2.4L L4 GAS Automatic 6 Speed
  Added Dec 2023 • 45 Fuel-ups

  Property of Amark5933

• 20.4 Avg MPG

• Gmc 2015 Terrain - Navy

  2015 GMC Terrain SLT 2.4L L4 FLEX Automatic 6 Speed
  Added Mar 2025 • 20 Fuel-ups

  Property of Envisionit

• 19.1 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 3.6L V6 GAS Automatic 6 Speed
  Added Aug 2019 • 176 Fuel-ups

  Property of TMO65

• 18.1 Avg MPG

• My Terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Sep 2023 • 69 Fuel-ups

  Property of kay8989

• 54.5 Avg MPG

• Terrain

  2015 GMC Terrain SLT 2.4L L4 FLEX Automatic 6 Speed
  Added Dec 2015 • 433 Fuel-ups

  Property of rgill429

• 17.9 Avg MPG

• GMC Terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Jul 2024 • 25 Fuel-ups

  Property of bntringa

• 21.4 Avg MPG

• Red

  2015 GMC Terrain SLT 2.4L L4 GAS Automatic 6 Speed
  Added Mar 2018 • 130 Fuel-ups

  Property of mouldman

• 22.6 Avg MPG

• Terran

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Oct 2023 • 49 Fuel-ups

  Property of FrozenFire

• 19.0 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added May 2018 • 46 Fuel-ups

  Property of keyates

• 23.3 Avg MPG

• Kelsey's Baby Truck 2.0

  2015 GMC Terrain SLT 2.4L L4 GAS Automatic 6 Speed
  Added May 2017 • 404 Fuel-ups

  Property of Kaszmann

• 22.3 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 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

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