I seem to can’t get away from ethanol and from all the negative effects of it:

1. The bad mileages (I have definitely noticed and proved about 4 mpg decreased!),

2. Low power although I’ve read that it does the opposite to turbocharged cars (I haven’t noticed the difference in my car)…and of course,

3. The corrosion in fuel system (in the long run)…although who knows what other bad additives are already in the regular gasoline sold by some gas stations. So far no one knows exactly how bad the corrosion is to the fuel system but it will cost some corrosion because ethanol has a tendency to pick up water whether from transportation process or storage.

The rest of the discussion on the forum can be found here.