[univacboy]

There are many older airplanes that were designed for much lower-lead fuel than is available now. 100LL ("Low Lead") still has several TIMES more lead than the 80 octane that would have been optimal in the older low-compression engines in use for many decades. There have been STCs (Supplemental Type Certificates) to make it legal to run unleaded auto gas in those engines; the problem with them currently is that they require gasoline without any ethanol, which is difficult to find in many places.

[ncmncm]

And the ethanol in US gasoline is there entirely to provide a market for Archer Daniels Midland to dump the alcohol it makes (under huge govt subsidy) to help absorb the huge (also very heavily subsidized!) overproduction of corn.

The addition of sugar to practically all processed food in the US is another response to that massive overproduction. Excess sugar is responsible for the ongoing, massive public health disaster that absolutely dwarfs COVID19. (But we are OK with it.)

And, feeding all livestock corn, despite its harm to their digestion and nutritive value of the result, just because it is the only way to be competitive.

Earl Butz, Reagan's Sect. of Ag, has a lot to answer for in hell. But there is more than enough blame to go around.

Anyone pushing for universal Medicare but not to eliminate corn subsidy is (at best) failing to address the root cause of the problem.