The article about not mixing is reporting that there is MTBE in the E0 fuel and the MTBE reacts with ethanol forming a brown slime. Most states banned MTBE several years ago so that seems far fetched. I suppose this is someone's speculation that there is MTBE in current E0 for the octane and oxygenation like the original reformulated gas.
There are growing options of lead free aviation fuel. Doesn't work for everyone but it is a good choice if you can get it. And this is real old fashioned gasoline, not the "reformulated" stuff sold for autos and trucks as E0, E10, E15 and E85 that contain a variety of solvents and byproducts.
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