4WD. 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. Awards: * 2017 KBB.com 10 Most Awarded Brands Reviews: * Appealing engines to choose from, including a thrifty diesel V6 and a brawny V8; plush interior with plentiful luxury and technology; enough off-road ability to conquer practically any trail. Source: Edmunds