A heads up to all Prius owners: be extra careful not to lose your key. When I returned from a by-air trip, I discovered I'd lost my key. I called Toyota for a replacement and discovered it costs $191 plus tax and a charge for programming, which was quoted at $98!!! So, I'm not ordering it unless I and lose my remaining key. I'm writing to Toyota HQ to complain about the cost and the lack of notice of this cost. I understand it's due to the computer and anti-theft programming.