Trillions of miles of data: Your car is spying on you, and it's only just the beginning

From your weight and facial expressions to your destination, cars collect a startling amount of data about you. Some of it may even raise your insurance costs. But you can take some simple steps to limit what they know about you. ... Modern cars are computers on wheels, and giant corporations are using them to suck up intimate details about your life and make more money. If you think driving today is a chance for solitude and independence, think again. And it looks like it's about to get a lot worse.