For the first time, GM customers will automatically receive a 3-month Sirius XM Radio subscription FREE when they purchase a pre-owned vehicle factory installed with satellite radio. This was announced on June 20, 2011 by Sirius XM Radio, and is effective regardless of the manufacturer. The main criteria are that the vehicles must be purchased from one of over 1000 participating GM dealerships across the United States. This is great news for drivers in Charlotte, Matthews & Monroe, NC!...