octane booster

[gofast at ix.netcom.com]

Hi guys. I *think* I am running out of octane in my BMW 530i - I have high 
compression pistons, and the car is choking at high rpms. Have checked most of 
the obvious things like fuel pressure, filter, etc.

I read here that xylene or Toluene is the way to get more octane. How much 
should one add to each tank?

What is the minimum octane I would need with 9.5:1 pistons?

Thanks in advance.

Samir Shah
gofast at ix.netcom.com
Stamford, CT