How to figure out which cars to avoid for privacy reasons?

Recently I saw mozilla's report on car privacy and it was really bad. The worst offender was Nissan because in their privacy police they admitted to all sorts of information will be collected. Right now I own a 2015 mazda6, and it's head unit only has Bluetooth, FM/am radio, and a backup camera. I'm trying to figure out which cars I should avoid buying to protect my privacy. How do I know what information my mazda6 is collecting, or if …

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