From what little I know about alternative fuel sources I think the Honda Clarity might be the best attempt so far:
http://automobiles.honda.com/fcx-clarity/
But why even have “alternative fuel” cars? God provides more than enough oil, gas and coal for us to use until the End of Days because it’s constantly being created. Don’t buy into the “fossil fuel” crap.
Oil, natural gas and coal come from a process that goes on deep in the Earth. Whether the process will ever be explained by science is unclear. I personally believe the creation of our energy sources could be a supernatural phenomenon.