GM announced the fuel economy numbers for both the 2015 Chevrolet Colorado and its fraternal twin GMC Canyon today, and those numbers are about what we expected—good, but not great. In fact, the 2.5-liter I-4's ratings are only a little bit better than the Colorado and Canyon's V-6 EPA ratings.
Two-wheel drive, four-cylinder Colorado/Canyons with a six-speed automatic transmission get an EPA estimated 20 mpg in the city, and 27 mpg on the highway, with a combined rating of 22 mpg. Trucks with a manual transmission, because it’s slightly heavier, will get an EPA estimated 19/26/22.
http://news.pickuptrucks.com/2014/09/2015-chevrolet-coloradogmc-canyon-i-4-epa-ratings.html