Clean CARFAX.GMC Dealership Serving Boulder, CO Drivers – Mike Maroone GMC GMC Sales, Service, and Parts in Boulder, CO If you have been longing to get into a new GMC close to Boulder, CO, then right now is an ideal opportunity to find your next auto at a low cost, here at Mike Maroone GMC. Enjoy Free Delivery anywhere in Colorado. Our GMC Truck line is headed by the Sierra 1500, 2500 and 3500, each new GMC model can be found here at our Boulder, CO dealership. Discover your new GMC in Boulder now for a test spin of your dream car.Reviews: * Spacious interior with quality materials; impressive number of high-tech features; available all-wheel drive; new twin-turbo V6 brings serious speed. Source: Edmunds * If you want a mature, comfortable full-size sedan with the presence and prestige for which Cadillac is known, the XTS fits the bill in a contemporary suit. On the value side of the equation, the XTS undercuts most European and Japanese rivals while still offering plenty of standard features. Source: KBB.com