I'm no chemist, and I don't recall much about vapor pressure from high school chemistry, but I've always thought of RVP as the boiling point of gasoline. If atmospheric pressure is 15 psia, and the temperature of the gasoline reaches a temperature where the vapor pressure is 15 psi, then the gasoline will boil. Which is why vapor lock is a problem for fuel lines which are under vacuum and routed near an exhaust pipe. But evaporation will occur at much lower temperature than the boiling point, same as water evaporates at temperatures below 212F.
The thing you have to remember about your sealed fuel container is it is a system in equilibrium: The pressure has risen in the container to the point where no net evaporation can occur. If you raise the temperature, the pressure rises as fuel evaporates, until a new equilibrium is reached. Hence the best thing you can do to keep gasoline fresh is to keep in in a sealed container.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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