Not like this is a surprise to anyone REMOTELY familiar with modern data flows, but still...For now, exactly what information goes where is a bit of an unknown by anyone other than the automakers themselves. As Fowler writes, "My Chevy's dashboard didn't say what the car was recording. It wasn't in the owner's manual. There was no way to download it."
To figure this out, Fowler had someone hack into the Volt. He discovered that the car was recording details about where the car was driven and parked, call logs, identification information for his phone and contact information from his phone, "right down to people's address, emails and even photos." In another example, Fowler bought a Chevy infotainment computer on eBay and was able to extract private information from it about whoever owned it before him, including pictures of the person the previous owner called "Sweetie."