Actually, if you could keep the stuff in the tire for more than a day or two, helium would be a great alternative for high-speed use, as it transfers heat better than almost any other gas.

 

Did you ever hear Bill Cosby's "200 MPH Car"?

In it he was talking about owning his Ferrari and when asked ...

Q. "why own a Ferrari? Where are you going to drive 200 MPH?

A. "Any side street will do ... I gotta get to work in the morning"

NO, I was just reading the online Motor Trend and stumbled across the article where they were talking about tires for the new Bugatti, Porsche Carrera, P Turbos, etc. where PS2s are specially made for those cars!