Chevrolet has announced the EPA numbers for the V6 Colorado. The 4x4 V6 is rated to deliver 17 mpg city, 24 mpg highway, 20 mpg overall. That's slightly better than the Toyota Tacoma V6.
V6 engines in full size trucks score almost as well. For example, the Silverado 1500 with V6, 6 speed automatic, and 4x4 is rated 17 city, 22 mpg highway, 19 mpg overall. The Ram 1500 4x4, with 8 speed automatic, is rated 16 mpg city, 23 mpg highway, 19 mpg overall.
So the Colorado's EPA estimates are kinda disappointing, considering that the vehicle is close to 1000 lb lighter than the full size trucks.
Still to come are mpg ratings for the Colorado with four cylinder gas and diesel engines.