I've just been reading the current edition of Wheels magazine where they have tested nine supercars with the mighty Z06 being one of them.
The Bugatti Veyron obviously trounced everything with a 0 to 100km/h in 2.5 sec and a top speed in excess of 400km/h.
The rest of the field easily ran in excess of 300km/h apart from the Dodge Viper which just fell short by a couple of km/h.
So basically these figures only end up being bragging rights that most owners will never see.
That is unless you live here:
195mp/h=312kp/h WOOHOOOO
I vote for Autobahns in Australia