Do they measure top speed on a power-run on a rolling road?
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If so, I'll tell you next week!

Yes they do measure top speed, but its only the speed of the wheels because aerodynamics has a big part to play as well.
I think on the RR my 1293 was achieving speeds of around 130 mph at 7300 odd RPM, but in a real world situation I think around 110 mph was the limit, it just couldn't move the air out of the way any quicker, being a flat fronted brick!
Good luck with the RR session (glad you got the Fiat sorted too!)