On Apr 26, 7:16 am, "Matt Barrow"
wrote:


It is amazing, how many people fail to realize that the 30% of aircraft that
HAVE TO HAVE 100LL are the ones that do 70% (or more) of the flying hours.


I have seen this 30%/70% number repeatedly, but I don't remember it
ever came from a scientific survey, or just someones rough estimate.

Regardless of that, this might be true in 1997, but I doubt it's true
anymore in 2007. Especially if you exclude engines there're
originally certificated for 91/96 avgas. Commercial operators flying
large number hours have been increasingly switching to turboprop
equipment in the last 10 years for things like feeder line freight,
air taxi or charter. That has contributed to the big decline of
overall 100LL consumption in U.S.