I generally clear everyone out in a rental as well. I should start letting the rental company know, thoug. That's a great idea. Fortunately, Android asks if

I generally clear everyone out in a rental as well. I should start letting the rental company know, thoug. That's a great idea. Fortunately, Android asks if you want to sync contacts, to which I always reply "No". It seems like that should be the default with an option to enable specific cars.