I've been in a VN Commodore (basically a 3.8L Cleveland (I think that's what they're called) V6 in a large family sedan) travelling at 210km/h. On a dirt road. As a passenger. In the back seat.
It wasn't for very long. The driver and owner decided that although the road was straight and flat, it wasn't really all that safe. He dropped back to 130, IIRC.
I think the fastest I've ever driven a car would also be 130km/h.
Wade.