2014 GMC Terrain Photo
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On Green
On Green
The four-cylinder Terrain has great highway EPA ratings; even the V-6 versions are competitive in gas mileage.
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GREEN | 7 out of 10

Expert Quotes:

2014 GMC Terrain four-cylinder: 22/32 mpg (FWD); 20/29 mpg (AWD)

2014 GMC Terrain V-6: 17/24 mpg (FWD); 16/23 mpg (AWD)

Eco mode recovers nearly 1 mile per gallon, though drivers are likely to forgo the setting's increased vibration and harshness for incrementally lower fuel economy.
Popular Mechanics

there's an "Eco" button forward of the shifter on four-cylinder models…It’s good for 1 mpg and worth remembering to engage if you're on a long freeway run, although it could prove annoying in stop-and-go situations.
Inside Line

The only GMC to be offered with a four-cylinder engine, the Terrain crossover is not surprisingly, the best GMC for gas mileage.

That's true if it's ordered with the base 2.4-liter four-cylinder engine, at least. Available in any trim level of the Terrain--from SLE to Denali--the four-cylinder is designed with all kinds of fuel-saving technologies that stretch its highway mileage to more than 30 mpg. Among those features: direct injection, and an 'Eco' button which, when engaged, causes accessories like the air conditioning compressor to be a little more conservative, has the torque converter lock up a little earlier, and makes the transmission a little more reluctant to downshift.

The net result is a crossover that's at least part miser, especially in its size class. The four-cylinder Terrain earns an EPA-estimated 22/32 mpg, a figure better than all the other mid-size crossovers except its corporate cousin, the Chevy Equinox. Adding the Terrain's available all-wheel-drive system doesn't ding fuel economy too badly: it still is rated at 20/29 mpg.

Once you choose the Terrain's optional V-6, the numbers take a big fall. The 3.6-liter V-6 makes much more power, but that leads to gas mileage estimated at 17/24 mpg--or even 16/23 mpg when all-wheel drive is fitted. Those figures are more in line with the seven-seat Acadia crossover--not a surprise, since the drivetrains have so much in common.


The four-cylinder Terrain has great highway EPA ratings; even the V-6 versions are competitive in gas mileage.

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