Via Bruce Schneier, your car does not respect your privacy anymore:
Mozilla recently reported that of the car brands it reviewed, all 25 failed its privacy tests. While all, in Mozilla's estimation, overreached in their policies around data collection and use, some even included caveats about obtaining highly invasive types of information, like your sexual history and genetic information. As it turns out, this isn’t just hypothetical: The technology in today’s cars has the ability to collect these kinds of personal information, and the fine print of user agreements describes how manufacturers get you to consent every time you put the keys in the ignition.
This gets even more complicated when you think about how cars are shared. Rental cars change drivers all the time, or a minor in your household might borrow your car to learn how to drive. Unlike a cell phone, which is typically a single user device, cars don’t work like and vehicle manufacturers struggle to address that in their policies. And cars have the ability to collect information not just on drivers but their passengers.
Consumers are effectively hamstrung by the state of legal contract interpretation, and manufacturers are incentivized to mitigate risk by continuing to bloat these (often unread) agreements with increasingly invasive classes of data. Many researchers will tell you the only real solution here is federal regulation. There have been some cases of state privacy law being leveraged for consumers' benefit, as in California and Massachusetts, but on the main it's something drivers aren't even aware they should be outraged about, and even if they are, they have no choice but to own a car anyway.
Note to self: no more don't start having sex in my Prius.