Since the Colorado and its twin, the GMC Canyon, were introduced, competitors have surpassed them in just about every category. The unrefined five-cylinder engine lacks punch and doesn't offer a fuel-economy advantage over competing V6s. The 3.5-liter grew to 3.7 liters in 2007. It had to work hard to power the crew cab we tested. Handling is sound but unexceptional. The ride is unsettled, and the body constantly quivers. The huge 48-foot turning circle makes parking a chore. Reliability of the 2WD model has been average, but the 4WD model is below average.