Let me try and explain it a different way and you tell me if you are confused or perhaps mis- reading.
RVP is the vapor pressure of the gasoline when the temperature is 100 degrees F. If gasoline has a RVP of 14.7 The same as the air around us it would boil at 100 degrees in a open bucket. If we change the RVP of the gas or increasing elevation and reduce atmospheric pressure we can change the boiling point of the gas. The closer we get a liquid to its boiling point the better it vaporizes. Such as a dish of water. If we sit it on the counter at room temperature it will turn to a vapor and evaporate. But if we heat the water it will evaporate faster. The RVP of the water stayed the same we just messed with the temperture.
In the winter we want RVP high so the gas will vaporize in cooler temperatures because a engine will not run on liquid gas; it has to be vapors. As the air temperature rises in the summer we lower the RVP to try and keep the gas in the tank long enough that we can use it but mostly to prevent pollution from evaporating gasoline. Yes some of it will evaporate but the lower we bring the RVP the less of it will. The pressure in your gas tank is proof of this. Some of the gas is vaporizing in the tank from the heat (closer to the boiling point) and is building pressure in the tank. The same thing happens to a 5 gallon can set in the sun.
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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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