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GREEN | 7 out of 10
2012 GMC Terrain four-cylinder: 22/32 mpg (FWD); 20/29 mpg (AWD)
2012 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.
A new entry in the GMC lineup in 2010, the Terrain is the truck brand's most fuel-efficient vehicle, and it's also one of GM's best crossovers for gas mileage.
The base Terrain's 2.4-liter four-cylinder gets some of the latest gas-saving features, like direct injection, in its quest for efficiency. It pays off, too: it's rated by the EPA at 22/32 mpg, higher than all its mid-size crossover competition save for the nearly identical Chevy Equinox. Even the addition of all-wheel drive doesn't harm mileage too badly: the AWD Terrain still earns a 20/29-mpg rating.
Perhaps even more of interest in four-cylinder models is the new '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.
Once you choose the Terrain's optional V-6, the numbers take a big fall. The 3.0-liter V-6 makes much more power, but that leads to gas mileage of 17/24 mpg--or even 16/23 mpg when all-wheel drive is fitted.
Gas mileage is a major selling point for the 2012 GMC Terrain.