Octane Booster Fuel Additive

This is a direct quote from a chemical engineer employed in the racing fuel industry:

“Adding more toluene,” Tim Wusz told us, “will increase the octane numbers of the gasoline, but when you get above 45 or 50%, throttle response is poor and the flame speed is reduced to where increasing amounts of fuel are still burning as combustion gases are forced out the exhaust valve. Once that happens, power is lost, not gained.”