After paying attention to your privacywe turn to your car. It's a wealth of information about you and yours, fortunately much easier to manage than the social network. Here are some tips that will work in almost every late model car.
Paired Phones: These are easily erased when you sell, rent or wait for your car. Mating does not do much without the phone nearby, but we are primarily paranoid here.
Phone Contacts: Are you sure you want to sync them when you pair your phone? Just say "no" when prompted, but be prepared for some inconvenience for on-the-road messaging.
Destination: Your car's navigation system has a good record of all the places you've tagged it with without requiring just a password. There may be a menu to clear these erroneous routes in your navigation settings.
Just wipe everything off: More and more cars have a single menu command that takes care of all the above things and blows out your personal vehicle settings, from radio stations to seat adjustments. This leaves fingerprints and your name on the title.
Black Boxes: Correctly namedthese were standard since the late '90s, drawing a rolling snapshot of your car's controls and how you used them. They are not meant to play with them, but an accident research company can probably do it for a price. I do not advocate manipulation of evidence. Determine if your state has rules on who can get the data. And since 2006, new cars have come with a message stating that they have a black box.
Hidden GPS Trackers: If you have reason to fear that someone has built one of them in your car, then you too I need a good divorce lawyer or sympathetic contact within the NSA, no roadshow article.