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Nissan is currently testing a solid oxide fuel-cell (SOFC) in Brazil, using ethanol as fuel. One advantage of this setup is that it's suitable to operate with a lower concentration of ethanol, about 45% dilluted in up to 55% water, while a piston engine won't operate properly with any concentration below 80% of ethanol. Just to remind, cachaça is usually standardized at 40% ethanol by volume...
Anyway, some reports are putting this setup in pair with non-hybrid Diesel vehicles MPG-wise, even though ethanol has a lower energy density.
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