Ron Wanttaja wrote in
:

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=getRecord&metadataPrefix=html&iden
tifier=ADA174091

Chevron says mogas is good for at least a year:

http://www.chevron.com/products/prod...longterm_gasol
i
ne/

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


If you leave it in your airplane, it isn't stored in a tightly closed
container, though, is it? It sure isn't in mine!
I have noticed the difference and found that mogas, having sat in an
airplane for a few months, is a lot harder to get going than equivelant
Avgas in the same airpane.

Might be my own notions based on the info I'd received, but my arms
would disagree!

Also, we have a shell petro-chemical engineer in our circle and he tells
us that the aromatics in mogas evaporate more readily thuus causing the
degradation in quality.
He also gave us a very frightening ocument relating the dangers of the
chemicals in modern mogas! You don't want that stuff on you or in you!

Bertie