Fuel Economy / MPG » 7
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GREEN | 7 out of 10
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.
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.
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.