You're never going to get much with writttings like that. Not everyone reads the list everyday, and then at times, those that do, only have a limited amount of time to spend replying, so yes you might have a post that goes unanswered for more then a day, heck some guys seem to only write on the weekends......
But, to answer your question, gasoline is brew of many chemicals, and they all have different boiling points. That's in part why we have winter and summer brews of gasoline. You want a fuel with a higher boiling point in the summer so it doesn't evaporate overnight, and then a lower boiling point in the winter since it's less likely to evaporate, and makes the engine easier to start. Two major terms used in gasoline, are low end aromatics, and high end aromatics (the terms vary slightly by company). But, it's a blend of these classes of chem that give you the *octane rating*. Any gas that sits over a week or 10 days has drastically lost it's advertised octane rating.
This is a huge subject, and if you want to get really into it, googling for gasoline, aromatics, benzene, tolulene, and other chemicals that you turn up will lead to even more info.. Be sure to look for MSDs, for the various chemicals.
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