As there is a 120 km/h speed limit (75 mph) on highways here, I never went much faster (well, maybe 130-140 :D) as I am afraid of being fined.

As passenger I already was in faster cars, e.g. 205 km/h (127 mph) in a Citroën XM or 190 km/h in Peugeot 106 Rallye.