"Over time, Mogas deteriorates faster than Avgas"

On Sat, 15 Sep 2007 13:45:13 -0700, Jay Honeck wrote:

This from a thread in rec.aviation.owning:

Leave unleaded mogas in your lawnmower for a year, and it
likely won't start. Autogas lacks the stabilizer package found in
avgas.

You know, I've heard that ever since I started using mogas in my
planes, but I've never seen a cite, nor have I *ever* noticed a
problem with unleaded gasoline in *any* of my lawn mowers, leaf
blowers, or snow blowers.

I put 'em away in the spring/winter, and start 'em up the following
winter/summer -- and away we go. Same with my Honda Goldwing -- I
top
it off, and it just sits till next year. No troubles.

Can anyone point me to anything that proves (or disproves) the "fact"
that unleaded mogas deteriorates faster than avgas?

One would think this provides the answer....

http://stinet.dtic.mil/oai/oai?&verb...er =ADA174091

Chevron says mogas is good for at least a year:

http://www.chevron.com/products/prod...term_gasoline/

"Chevron gasoline can be stored for a year without deterioration when the
storage conditions are good -- a tightly closed container and moderate
temperatures."

But then, they say that same thing about Avgas:

http://www.chevron.com/products/prod...8_ag_perf.shtm

"Avgas that has been properly manufactured, stored, and handled should remain
stable for at least one year. "


Ron Wanttaja