[CBFryman]

define racing fule? 112 octane tells us nothing. Alcohol Mix? Leaded gasoline? a Nitro Alcohol mix? Ethanol can be hazardous to to fule systems if they have certian type of fittings and the injectors are mad of certian types of metals/platics. however if the car is certified to run on E85 there shouldnt be a problem.
Nitro Alcohol mixes are quite corosive to a lot of materials, generally Brass and Aluminum fittings are all that can be used as far as my knowledge goes.
Leaded fules wreak more havoc on your EGR system and Catalytic converters...
if your engine is stock running any of the above shows no benefit except for a nitro alcohol mix.