So... twice now I've gotten in the Tesla and driven away without the key, presumably because the key in the house is close enough to the garage. The car did warn me eventually so I could go home and get it before I got too far. I've never had this problem with my other car with key-less entry. Does anyone know - Did Tesla build their own key system or buy an existing manufacturer's? This seems like pretty basic and important functionality... sensing the key inside vs outside to prevent things like accidental drive-away or locking the keys in the car. I know that they originally advertised key recognition for user preferences as well. I wonder if they are having general problems with the key system. Hoping that this will get a fix someday.