Your OnStar-equipped car can share an awful lot about your driving habits -- even if you're no longer an OnStar customer. A senator from New York has asked the Federal Trade Commission to open an investigation into vehicle tracking by General Motors' OnStar division. Two other senators issued calls for the company to explain and reconsider its tracking policies. OnStar, which provides a variety of services including vehicle diagnostics, driving directions and automated 911 calls to owners of mostly GM vehicles, recently announced that it reserves the right to track and sell information about vehicles' location and speed even after the driver has stopped subscribing to the service. OnStar, which has around 6 million subscribers, relies on GPS tracking and other systems built into the car. Senator Charles Schumer, a Democrat from New York,... called the tracking one of the most brazen invasions of privacy in recent memory." Senators Al Franken and Christopher Coons, both Democrats, sent a letter to OnStar last week saying that the company's actions "appear to violate basic principles of privacy and fairness." OnStar reserves the right to sell "anonymized" information collected from vehicles to outside companies. "Anonymized" data is aggregated on cannot be traced back to any individual vehicle or person. But hackers have been able to tease out individual user information from supposedly anonymized data, Schumer noted in his announcement.