Sen. Edward Markey has expressed some alarm at the amount of data being collected (and distributed) by vehicle manufacturers. His office has produced a report [pdf link] showing that while many manufacturers are involved in collecting data, very few of them seem concerned about the attendant risks. Even worse, many respondents to his office's questionnaire seem to show very little understanding of the underlying technology and most have not made an effort to fully inform customers as to how much is being collected or how it's being distributed.
Drivers of today's connected cars aren't going to like the report's findings.
Nearly 100% of cars on the market include wireless technologies that could pose vulnerabilities to hacking or privacy intrusions.