Conflict with aircraft fuel systems and Ethanol are many:

http://www.pmawwacs.org/downloads/go...ce_ethanol.pdf

California formulation is only about 5.7 percent Ethanol, so that
Cherokee 235 may get away with it for awhile, especially if it flies
to other airports and refuels with avgas cutting the percentage even
more.

The bottom line is that at the moment producing Ethanol from corn
wastes more energy than it makes according to experts. The EPA has
ruled California no longer has to use it. But will be some time
before stocks no longer contain it. That's what I read anyway.