This is GM's re-entry into the small truck market. The Colorado was designed specifically for the North American market and GM promises better fuel economy than Japanese competitors. The Colorado's base engine will be a 193-horsepower 2.5-liter four-cylinder. A 302-horsepower 3.6-liter V6 will be available as an option. Both engines will come with 6-speed transmissions. A diesel engine will be offered later.