290 KPH indicated which according to my Garmin GPS 195 was 270 KPH (170 MPH). I will need to do again to confirm, as was too busy watching for traffic. GPS confirms that the speedo is about 7% optomistic all the way up. I haven't checked the odometer yet, but I suspect that it suffers from the same fate.
I am 6' 2" and about 200 lbs. and could not get my helmet (and fat *** ) fully behind the windscreen. I too ran out of road, but was surprised at what felt like the bike running out of steam above about 250-260 KPH indicated (160 MPH).
I would appreciate comments on the last 30 MPH from 160 to 190 as far as tuck and time that it took to get there.