I purchased my new 09 Gt 2 months ago. Recently, the car sat for 2 days without being driven and the battery was dead. Took to the dealer service dept. and was told everything was just fine. They say it has a lot of "modules" and is an "intelligent" car. Therefore, it must be started and left running for 30 minutes at least every 2 days. Thinking this is absurd, I contacted ford Customer Service via email. Would you believe, they actually agreed with this diagnosis. I refuse to believe that Ford would sell a vehicle that can't hold a charge more than 2 days and has to be atarted and left running (wasting fuel) every 2 days. If I were to travel for a week, for example, I'm told that I can count on having a dead battery in the airport parking lot upon my return. My neighbor has a Lexus that is FAR more intelligent than my Mustang and he can go away for 3 weeks at a time and return, start his car and drive away. Has anyone else had this problem? Can this really be true?