Close-loop energy cycles, back on the ranch

Interesting - everyone talks of biofuels as potentially one of the ways to break the petroleum industry's grasp, and yet has anyone heard of biofuelled tractors? Wouldn't this only make sense, to create a way for farmers to run all of their machinery from their own fuel?

Similarly, if someone could create fuel cells that could break down salt(or fresh water) for boats, would it be possible to have nautical engines that only need periodic membrane replacements? Especially at the personal watercraft level, where large engines are pulling only a nautical mile/gallon, this could have an amazing effect. Case in point, when you hear about people not wanting to drive their boats because they can't afford to fill their gas tanks...

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