Expect cars to very soon implement bio-security measures so that the car can identify the driver using more than just which key they are using. If a teenager sneaks out and takes the car then it may be the car that snitches on them. They will probably also implement parental controls so that junior can't turn the car on after 10pm unless mom or dad is with him.

Also, make sure you get it back in time to fully charge it before your parents need to drive it to work. It's not as easy as topping off the tank in an ICE engine car.