I'm no engineer. Not even close, and lots of numbers make me queasy. So a question for someone better at it than I. Ethanol, moonshine, juice, whatever you want to call it, is a relatively easy to make renewable resource made from plants. Got that part. Car engines cannot tolerate more than, what, 15% ethanol in the gas mix? So.....what would be required to build an engine that ran only on Ethanol? Or is ethanol alone, not combustable enough to use as fuel?