All depends on the position of the car during the fall.
If you could talk it into falling nose first, the terminal velocity would be somewhere around 313 MPH, and only 4700 feet would be required to reach this speed.
Falling horizontally, the terminal velocity would be 117 MPH, about the same as a skydiver with arms and legs out.

http://www.autospies.com/news/Lexus-...-it-out-14821/