My best mates cousin has built a hydron fuel cell and placed it in the boot of his carthe car runs petrol but it draws off the hydrogen into the carby via normal aspiration the result is a 30% increase in economy. So why not combine a bio fuel like ethanol with this idea thus using less bio fuel or say run a bio diesel engine but draw the hydron to boost the octane ratingor run the bio diesel engine that produces and compresses the hydrogen for use in other applications like heating and cooling or gas cooking as the chef allway preffers gas hot platesHydrogen is a fantastic storage device for energy rather than ugly dirty pollutting battery cellsThe amount of energy used to create battery complely out prices the toyota prius