Chevrolet Colorado -- Photo Gallery: Small isn’t what it used to be. Today’s small soft drink from the fast-food joint is yesterday’s large, and the small cars and trucks of 2007 are equivalent to midsize models of decades past. The pickup truck segment, especially, has seen growth, literally and figuratively, with powerful engines and plentiful room for up to five passengers. Among them are the Chevrolet Colorado and GMC Canyon twins, attractive enough models that have suffered from relatively weak powerplants. Consequently, GM has added some gusto under the hood for 2007, though ultimately it’s not enough to compete with brutes such as the Nissan Frontier.