As the car gets close to Production there are still some gaps in our Roadster knowledge. Here is a place to put the unanswered Tesla Roadster questions. Even the small ones. Many questions will have unofficial answers that have been in the blogosphere (like the car's Cd) but please limit answers to OFFICIAL Tesla Motors Stats with links to the published data. What is the turning radius of the Roadster? What is the drag coefficient of the Roadster? (there have been numbers bantered about but have any of them come from an OFFICIAL source?) What kind of run flat fix a flat tire arrangement does the Roadster have? What kind of cup holder does the Roadster have? What brand/model # is the stereo/GPS system is in the Roadster?