If ethanol from corn is such a great thing, let the farmers run it in their tractors. If they have to convert, so what, so do we. MOST pre '88 vehicles (and engines) simply CANNOT tolerate blends with more than 10% Ethanol by volume with some, particularly small engines 5%. Who pays for the DAMAGE done? The government, farmers, refiners, producers or the equipment owner? Hmm.
You cannot afford to operate a tractor on ethanol to make corn, to make ethanol. There is not enough energy in it, it is that simple.
You cannot grow corn on marginal land, at least not for very long. Do YOUR homework, even if we used every tilled acre for corn, made ethanol with it we still could not supply 10% of the nations gas.
When ethanol, naturally high in octane, is blended the refiner can use a LOWER QUALITY FUEL and still get the pump octane they need. This, combined with the lower energy content of the ethanol per gallon, is a problem for fuel efficiency.
As ethanol blended fuels absorb moisture and degrade, the motor octane decreases. This can lead to pre-ignition, which will severely reduce fuel economy and can even do engine damage because peak cylinder pressures during pre-ignition can be 2 times higher than design pressures.
Blending gasoline with ethanol REDUCES it's shelf life, in some cases very significantly. We used to be able to store gasoline for a few months and in rare cases with high quality fuels, even a couple years and still ahve enough volitility to operate the engine w/o damage. Currently, with E10 blends, you are damned lucky if your fuel is "good" after 30 days and in some cases 14 days.
Unless an engine is DESIGNED for ethanol blended fuel, you should not be using it. Engines specifically designed to operate on high percentage ethanol blends can actually increase performance and mileage over a similar engine on straight gasoline, but that is the exception and not the rule.
E85 has almost exactly 2/3 (0.667) the energy per gallon as neat gasoline of the same "grade". You WILL use more fuel with E85 than with neat gasoline, your cost per mile will increase AND you are already paying a Federal (and in most cases State) subsidies to the ethanol producers.
For those that blindly support ethanol and refuse to admit it's faults. Please DO NOT come crying to me when you can't afford a good steak or clean water to drink because you chose automotive fuel over food and water.