Aviation fuel systems are very robust, but they are also filled with old-school materials. Fuel caps, bladders(tanks), lines(Alum), valves(brass/steel), gaskets, jets, and needles contain many rubber compounds, and things that don't play well with any kind of alcohols.
We use lead to raise octane levels. Avgas is the only leaded fuel left in the world. There's no way to use an ethanol laced fuel in planes. It would destroy the fuel system.
Most airports no longer sell fuel to the public for non-aviation use. It's actually against the law to use avgas in anything that is not used for aviation.
There are plenty of studies on both sides of the Ethanol debate. I generally ask 'who gains?' when studying an issue. In this case, the HR members of the corn producing states, along with ADM and Cargill are huge beneficiaries of the fed subsidies on Ethanol production. Untainted evidence is hard to come by. Most studies add, or subtract ancillary effects to make the numbers work right.
It's my opinion that the oxygenates which add to the fuel to make it burn cleaner are not sufficient to qualify for the massive cost subsidies in most modern cars built after about 1989. The second gen catalytic converters starting in the late 80s do little or nothing with the added oxygenate in Ethanol fuel. They were developed to burn off the HC and CO and catalyze it into the water vapor and CO2 which produces CO in small PPB no matter ethanol added or not.
I'm fine with adding ethanol to fuel if the customer wants it. I am not fine with the govt paying Cargill, and ADM trillions of dollars of tax for the possible, but not fully proven reduction in emissions(when the full calorimitry of production, distribution, distillation, delivery, blending, and monitoring is taken into account). There is also the 'lost market' principle that deals with what would replace the ethanol produced if the mandate went away. I don't care, and that is a question for an open market to decide, once the fed subsidies are gone. If ethanol fuel can stand on its own, then so be it. Mandating something and having a govt pay for a commodity like ethanol is bad govt.
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