Maybe the Stirling engine is the way forward? I'd never heard of it before, but it looks mighty interesting:
http://alfin2100.blogspot.com/search/label/Dean%20Kamen
"A Stirling can run on just about anything that creates heat, from gasoline, kerosene, and ethanol, to natural gas, propane, hydrogen, and, yes, the methane given off by animal manure."

It looks more than interesting Nick, I would liked to have seen it running in the vehicle however :-/
It does show that research is the dominant force in any desire for change and such research, should not be bound to the contemporary disipline.
The real worth of this technology, if it is indeed practical, lies with the ability of the individual to generate his/her own energy from an easliy powered engine, independent of the national grid

That could solve many of the very problems knocking on each and every door at the moment

I fear that we all must begin to realise that the only way we can be sure of surviving with any degree of reason, is that we must be in a position to help ourselves

The state seems to be unwilling or incapable of doing it
