Based on data from 54 vehicles, 3,913 fuel-ups and 1,162,852 miles of driving, the 2015 GMC Terrain gets a combined Avg MPG of 21.32 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 (11) Any Body Style Sedan (1) Sport Utility (13) Any Submodel SL (3) Denali (4) SLT (12) SLE (35)

Below you can see a distribution of the fuel-ups with 129 outliers (3.19%) removed.

Following shows the average MPG of each of the 54 vehicles in the system.

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• Thing

  2015 GMC Terrain SLE 3.6L V6 GAS Automatic 6 Speed
  Added Aug 2019 • 26 Fuel-ups

  Property of dragon05452

• 18.3 Avg MPG

• Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added Aug 2016 • 319 Fuel-ups

  Property of dbwoot10

• 22.9 Avg MPG

• My Terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Sep 2017 • 46 Fuel-ups

  Property of Patriots

• 32.9 Avg MPG

• GMC Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed Sport Utility
  Added Jun 2018 • 64 Fuel-ups

  Property of toverton

• 21.3 Avg MPG

• Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed Sport Utility
  Added Jul 2018 • 16 Fuel-ups

  Property of jthornburg72

• 22.8 Avg MPG

• GMC

  2015 GMC Terrain SLE ٢٫٤L L4 FLEX Automatic 6 Speed Sedan
  Added Aug 2016 • 261 Fuel-ups

  Property of hjammal0

• 19.7 Avg MPG

• 2015 GMC - Terrain

  2015 GMC Terrain SLE 2.4L L4 FLEX Automatic 6 Sport Utility (4 Door)
  Added Jun 2015 • 124 Fuel-ups

  Property of ArnpriorCommuter

• 22.2 Avg MPG

• Roadtripper

  2015 GMC Terrain SLE Automatic 6 Sport Utility (4 Door)
  Added Aug 2014 • 18 Fuel-ups

  Property of btitus

• 24.4 Avg MPG

• My Terrain

  2015 GMC Terrain SL 2.4L L4 FLEX Automatic 6 Speed
  Added Apr 2017 • 65 Fuel-ups

  Property of Hazels

• 26.7 Avg MPG

• My Terrain

  2015 GMC Terrain SLT 2.4L L4 FLEX Automatic 6 Speed
  Added Oct 2017 • 6 Fuel-ups

  Property of pinkertonje

• 23.1 Avg MPG

• My Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added Mar 2017 • 17 Fuel-ups

  Property of Anixs

• 22.2 Avg MPG

• GMC terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Mar 2017 • 71 Fuel-ups

  Property of zooview1

• 21.3 Avg MPG

• Terrain

  2015 GMC Terrain SLT 2.4L L4 FLEX Automatic 6 Speed
  Added Mar 2017 • 27 Fuel-ups

  Property of marcinthedark

• 33.3 Avg MPG

• 2015 GMC Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added Mar 2017 • 64 Fuel-ups

  Property of joyofdriving

• 21.3 Avg MPG

• GMC Terrain

  2015 GMC Terrain Denali 2.4L L4 GAS Automatic 6 Speed
  Added Aug 2016 • 86 Fuel-ups

  Property of rainboaa

• 23.9 Avg MPG

• Kelli's car

  2015 GMC Terrain SL Automatic 6 Speed Sport Utility
  Added Mar 2018 • 87 Fuel-ups

  Property of dunkdave

• 22.7 Avg MPG

• My Terrain

  2015 GMC Terrain SLT 3.6L V6 GAS Automatic 6 Speed
  Added Feb 2017 • 3 Fuel-ups

  Property of marcelg

• 23.6 Avg MPG

• Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS Automatic 6 Speed
  Added Jan 2017 • 6 Fuel-ups

  Property of georgewbeach

• 20.9 Avg MPG

• GMC Terrain 2015

  2015 GMC Terrain Denali Automatic 6 Speed Sport Utility
  Added Oct 2017 • 60 Fuel-ups

  Property of 2Rotars

• 17.6 Avg MPG

• Terrain

  2015 GMC Terrain SLE 2.4L L4 GAS
  Added Jul 2016 • 9 Fuel-ups

  Property of Thetucks

• 27.2 Avg MPG

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