Two questions: 1. If I buy a model s now and pay for autopilot (AP2), and I decide to buy another one (assuming its also AP2) a few years later, can I transfer the autopilot from the first car to the second one so that the newer one has autopilot (without paying extra for it) and the older one can be sold w/out autopilot enabled? 2. If 1) is a flat no, does the cost of autopilot depreciate with the cost of the car? I find this important if I would consider to replace the car in the future, since its less expensive to enable AP before delivery than after.