Cattle?
They don't use "sweet corn" they use field corn. After they brew the alcohol, they sell the expended mash to ranchers for use as cattle feed. It's a more nutritious feed than the raw corn, and they get two uses from the same feed stock.
Alcohol doesn't ruin engines, my only complaints are, that it doesn't reduce the price of gas, and it lowers your mileage. It should be cheaper.
Power?
Since they use the alcohol to achieve the "octane rating" (more controlled, slower burn) you can actually get more power with higher compression (or boost) and advanced timing, and not have pre-ignition problems.
"Premium gasoline" just has more ethanol.
Some race cars run on straight alcohol, and hardly produce any heat.
Alcohol doesn’t ruin engines,
= = =
Not the engine, but the fuel system parts.
It ate up the Quadrajet on my Ponitac 455.
It eats up carb and fuel system parts on small engines.
Ask outboard marine guys what it does.
And more.