"Bela P. Havasreti" wrote in message
...
In reading about this somewhere (AvWeb? EAA?) I recall words to the
effect that the refineries can get up to about 97 octane without any
lead, and they only add as much in to get to (or slightly exceed) the
100 octane rating.

This one: http://www.avweb.com/news/columns/182149-1.html

That's it! Thanks for the link (bookmarked it this time).

Most welcome!!

In another article, Deakin was talking about GAMI running a 375HP Lycoming
540 (the one most prone to detonation) on unleaded 95 octane gas on their
test-stand with their experimental PRISM system with nary a burp. AIR,
they've run TNIO-550's on mogas with the PRISM system, too.

Unfortunately, they're about three years overdue for their hoped for STC.