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For your car, the only benefit is fuel economy. In small engines (i.e. lawn tractors, trimmers, chain saws and blowers), the benefit is longevity of the equipment. Automotive manufacturers take great care ensuring that the polymers used in their products will be resistant to ethanol. Manufacturers of small engine products typically do not do so much. Therefore, corrosion in this type of application would be more significant. In addition, ethanol is hygroscopic meaning that it absorbs water. Over time, usually in a month or so, the ethanol/water phase separates to the bottom of your tank (ethanol and water are more dense than gasoline). This isn't such a big problem with your car because you usually won't keep the same gas for months at a time.
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