Fine, 9001.
This may not count due to the whole perfect inputs thing, but this guy maxes out around 12000 kph: https://www.youtube.com/watch?v=-NbduA_aLT0
Interesting, but his drops and stuff, (wob wob wob) Zone ramps up and stays where it is no matter what you do - as fast as that is, the constant drop outs in speed and track simplicity don't match the huge difficulty of going around a circuit constantly at a few thousand KPH (or is it MPH?) with energy critical when the circuit is just so chock full of nasty bends, drops, sharp u turns, not to mention trippy as hell graphics