[ASOC]

When E fuel hit Ak, we got the horror stores of ruined engines, etc.

Alcohol is a solvent. Alcohol is an oxidizer - which is why they put it in the fuel. In older vehicles, adding alcohol will dissolve all the 'crud' built up in the tank and send it down the fuel line with predictable results. I don't know what effect it may have on the carb bits.

Once the sheet metal tank is nice and clean, the oxidizer part starts to have fun with the old tank.

Solution? An in-line filter changed very often.
As for the rusted out tank, alcohol is also anhydrous so can cause problems that way as well. I believe in Brazil, car are equipped with Stainless Steel tanks.

[Kozak]

I used ethanol blend in my 78 Rabbit and it was a nightmare. Completely fouled the engine. Maybe thats not an issue with newer cars, but I would like to have a choice of not using ethanol.