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It's possible here to find gasoline that doesn't have ethanol. They usually have a large sign outside that says, "100% gasoline sold here". A few stations here also have both. Although it does cost more for pure gasoline, I've noticed a change of about 5mpg switching between them.
I asked my mechanic a while back if there were any adverse effects to using ethanol fuel and he told me that over time it will etch the inside of the tank and send metal shavings through the fuel system. There happened to be an older Porsche there that they were flushing the lines and changing the fuel filter. I was skeptical to his claims until he showed me the fuel filter and to my surprise there were metal shavings. They also showed me the waste bucket from flushing the lines and there were little metal shavings all over the bottom of the bucket.
I can't think of anything else that would cause such a thing. I've since switched to using pure gasoline.
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