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David,
I'm glad you posted this morning because my calculations were wrong. I was in a hurry and rushed through my response last night. I should just shut up if I don't take the time to make sure I know what I'm doing. In any event, to follow your post, note that 4.5 gal in 19.5 gal (15 + 4.5) is only 23.1 % so of course you need to take the final volume into account. What is scary is I do this stuff for a living so I should know better.
Wayne,
I'm a chemist and you are pretty much correct I think. As least the stuff I know about. I think the flash point of gasoline is quite a bit lower than toluene becuase it is a lot more volatile. Also I think the boiling point is a useful measure of volatility. Toluene boils at 110 degrees and xylene around 135. I think the gasoline fraction is usually around 60-80 (not positive about this) so it is quite a bit lower boiling. For this reason I wouldn't expect much aromatics (benzene, toluene and xylene) in normal gasoline.
Regards,
Jack Z
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