Posted by MarkB_MI on May 12, 2016 at 15:23:35 from (70.194.19.88):
In Reply to: 100LL Avgas posted by Eric in IL on May 12, 2016 at 07:18:01:
It is a fact that avgas has a long shelf life, but you need to understand why. Avgas evaporates slowly because its Reid Vapor Pressure can be no more than 7 psi. The vapor pressure requirement is not intended to improve shelf life, but rather to prevent vapor lock at high altitude or on hot days. The lower the vapor pressure, the less volatile the fuel and the longer its shelf life.
There was a time when there was a big difference in the RVP of avgas versus auto fuel, but that's no longer really the case. Over the years, tightening emission standards have significantly lowered the maximum vapor pressure of fuel in many localities. In some places, it's the same as avgas: 7 psi. In other locations, summer-grade gas is allowed to be only slightly more volatile than avgas. Refer to the link below to see the maximum vapor allowed in your area.
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