summer gasoline formulations) and by region - summer gasoline with a higher vapor pressure is mandated across the country in places with dense enough populations that there are difficulties with air quality in the summer, and on the coasts entire states or regions. The answer is that what is in pump gasoline varies considerably by season (winter vs. That might have been approaching correct in the 60s, but that is not true today. What is gasoline anyway? A naive guess might be that it was more or less pure 2,2,4-Trimethylpentane (aka isooctane) with some "other less desirable stuff" thrown in so as to have an "octane number" of 87 or 93. There's a lot of folklore surrounding E10 (which is a default case for pump gas these days). Yesterday I dropped by the BP station in Warrenton to pick up a gallon of ethanol-free gasoline for the chain saws and string trimmers.
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