Part of the problem with ethanol blend fuels is that ethanol is used as the octane booster and if the gasoline gets about 1.5% water in it by volume, the ethanol/water mixture will separate out and leave the gasoline with an octane of about 82... not good for your engine.
Also, since ethanol acts as a fuel oxygenator, it causes you to lose some MPG, since it has effectively replaced the carbon and hydrogen found in non-ethanol blend gasoline with oxygen. This means you're paying more for the gasoline and getting fewer miles out of it, because you're paying for oxygen, which was free with the older MTBE blends.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.