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Interesting thread, guys, though I have no intentions of running "Mogas" in
my Lyc. O-235-L2C (I've installed the Lycoming high compression pistons so I
need 100 octane to keep from burning holes in them).

>From experience, I can tell you that the quality of what you get from a
service station pump can and does vary all over the map. Some may be good
enough to feed a low compression (high detonation margin) aircraft engine -
but don't count on it!

Case in point: While recently trailering my '64 Porsche to my current place
of residence in Northern Idaho from southern California, I filled up my GMC
Yukon somewhere in Oregon and could hardly keep it running. Within 30
minutes of the fill-up, I could hear distinct "pinging" (car-talk for
detonation) even when I wasn't pulling a hill. (this in a big 351 V-8 that
requires only 87 octane "regular"). It got progressively worse as I dipped
further into the fuel from that latest fill-up. I stopped at a local GMC
dealer and the mechanic diagnosed the problem - lousy fuel. He said they had
seen this quite a bit lately - especially when the prices had shot up around
the country. Figured the suppliers were dumping anything that would dissolve
into their product. Long story short, after draining all but a few gallons
of the stuff and filling with Premium go-juice, the problem went away - so
it wasn't anything wrong with the engine, just real bad gas.

There's no guarantee that the suppliers don't do that with any of their
grades of fuel - so if you want to test your luck at altitude (or worse, at
take-off) try a load of "mogas" in your Lycoming or Continental. And good
luck!

Dan Schaefer

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