"Jim Carter" wrote:

Some have been posting about using 92 or 93 octane mogas and removing
the Ethanol to get to the 90 or so octane for the old 80/87 engines. If
the testing and rating is different between mogas and avgas, is there a
conversion chart or algorithm somewhere so that we at least start with
the right stuff before we try to remove the ethanol?

They are close. Here's a link to an article that seems to sum up the
octane business in layman's terms:

http://www.prime-mover.org/Engines/G...es/octane.html