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 - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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