On Mon, 17 Sep 2007 06:16:42 -0000, M wrote:


...I do believe that
mogas deteriorates faster than avgas. The reason is probably due to
different chemical make-up btween mogas and avgas. Mogas's end
distillate is slightly heavier, meaning it has more larger hydrocarbon
molecules in the mix compared to avgas...

My understanding is that the vapor pressure of avgas is lower than
mogas, to prevent vapor lock at high altitudes. This would make it
keep longer if the storage container isn't perfectly sealed, as mogas
would lose more of the volatile fractions. It would also explain why
avgas plain smells better.

For 2-stroke flyers, there are also concerns about the longevity of
premixed fuel/oil (another endless topic on the ultralight boards).

-Dana
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