I'm back from a visit to the Autobahn in Germany.
This picture is from an RS6 Avant (Hohenester 500 hp).
The car started to feel a little light in speeds above 300 km/h.
A jumbojet takes off at 270 km/h so I guess it's ok considering...
Background 1200 pixles wide
http://www.rs6.com/pics/Various/RS6-315-1.jpg