Brazil has a lot of dedicated alcohol cars, so it's actually not so much a big deal. I've read of guys making their own ethanol in stills and only refining it to about 160 proof; i.e. 80% alcohol, 20% water. It's perfectly fine as long as you NEVER run the car on gasoline again. I don't see nearly as much future in ethanol production as I do diesel, to be entirely honest. Ethanol (from what I've read) takes quite a bit more energy to produce, comes from lower-yeild, higher cost feedstock, and of course E100 is only 76,000 BTU versus B100 biodiesel at 128,000 BTU.