Dallas wrote:
My C150M POH shows an approved fuel grade includes AVGAS 80.

Assuming you could find 80, how safe is it to run?

And, what are the modifications made to the fuel system to run MOGAS?

On a purely theoretical level, what would be the ramifications of fueling
up an unmodified Cessna 150 with 92 octane MOGAS?


Low compression engines work well on 80 octane. The problem with 100LL
is that you don't need the extra octane (does nothing for you) but you
also don't want all the extra lead. 100LL is only "low" in lead
compared to the old 100/130 fuel it replaced. It has 4 times the lead
that 80 did and way more than premium auto gas ever did.

The only problem is the corn lobby is making it pretty darned difficult
to find autofuel without ethanol in it and ethanol is not approved for
the autofuel STC's (and it plays hell on us boaters too!)