"Dave Stadt" wrote in message
...


You probably already know, but that 25% that needs 100LL is the bunch
that
flies 75% (or so) of the hours each year.

I would need to see something to support that. The 100LLers are the high
performance engines which in my experience sit in the hangar. Given, on
those few occasions when they do venture out they burn a lot of gas.

AOPA GA Fact Sheet:

"General Aviation aircraft flew an average of 144 flight hours each in 1997,
but considerable differences existed within the fleet: the average for all
piston aircraft was 133 hours (131 hours for piston singles, 149 for
multiengine pistons); 295 hours for turboprops; 331 hours for jets; and 307
hours for rotorcraft."

Also, the higher performance aircraft are used in a lot of cargo hauling and
air taxi...they fly a lot.

Then too, while it's anecdote, John Deakin says "The owners of the 70% of
the airplanes that burn 30% of the fuel will yell, "Give us a low octane
fuel we can use, and find something else for those other guys." Two fuels
isn't going to work — the two-fuel infrastructure is no longer there." I'd
say he's a lot closer to the industry than you or I.