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. Cars used to mean freedom. When I first got the keys to the old family Toyota it was a rite of passage, a sign I was old enough to step away from the watchful eyes of my parents and enter a world where time and decisions were mine alone. Things change. Modern cars are