Robert M. Gary wrote:

In most of the U.S. "permium" fuel is illegal in aircraft because the
U.S. adds alcohol to the fuel to make the corn growers happy.

That's a bit of overstatement. Gasoline sold in most of the areas of
U.S. are alcohol free, because the corn growers's lobby has been so
successful that they managed to legislate their product into areas
requiring oxygenated gasoline and that essentially used up all the
domestic ethanol production capacity. Wholesale ethanol price has been
higher than wholesale gasoline price, even with the subsidy, the last
few months. Domesticly made fuel were supposed to save us money, for
Pete's sake!

I think less than 20% of U.S. population living in areas where
oxygenated gasoline are required, and it covers less than 15% of the
area. Oil companies will be foolish to put this expensive stuff in
gasoline where it's not mandated.