Uhhh, kinda embarrassed. Too long since high school, should have done my
research before spouting off... I'll back the other Matt now. Cs&Hs, no Os
until you get into the additives etc.

Been fooling around with wood chemistry too much.

surfnturf

snip the embarassment
"Matt Colie" wrote in message
...
Matt,

Believe it.

Of that stuff you call gasoline (those things that come of the the
distillation between 100 and 200 degF) there is no chemical formulae.

It is all organic hydrocarbon and the best they can due is provide a
hydrogen/cardon ratio. And that is Gasoline...

What gets added after that is anybody's bet. It isn't Tetraethyllead
Pb(C2H5)4 anymore, but it can be any portion of a chemical alphabet
soup (like MTBE, TAME and ETBE) with out even getting to the oxygenates.

Most what was added in teh pst improved the octane rating. now what is
added is largely to improve the combustion efficiency.

Matt Colie (Engine Lab Rat -ret)