[NeedAntiVenom]

Bob,

Xylene and tolulene are ring structured organics with delocalized bonds. Due to the ring structure they are related to the pentane and hexane chains but formed into a ring structure, cyclohexane, by replacing some hydrogen bonds with double carbon bonds.

While many of these compounds are in gasoline, many of them are not desired in large quantity - particularly tolulene, benzene and xylene. They are effective at increasing the equivalent octane rating but why? VP Racing fuels sells oxygenated performance unleaded, 100 octane rated fuel for $4/gallon.

I am by no means an expert on fuels, but IMHO, it just seems to me a lot of trouble to go to for little cost vs the cost of rebuilding your motor when you get it wrong.

FWIW, just trying to share what little I know....


Jim