I never realised you were so "earth-friendly" Lee! You are quite right, you can make fuel out of just about anything that grows these days. And, yes, you are right about wheat stocks falling which is largely due to bio-crops. Bio -crops also need a high level of fertilizer, intensive farming. So you are solving one problem and creating another. Also the cost/carbon footprint of converting raw vegetable matter into bio-ethanol as opposed to fossil fuel is virtually the same.
Palm oil has got to be the most intensely farmed and destructive agriculture around the world at the moment.
And Tony is right Brazil used to be fairly dependent on imported petrol, now they are totally self sufficient in bio-ethanol and Volkswagen has produced a car specifically for Brazil to run on Bio-ethanol, called the Gol.
When I started this thread I initially wanted to know if anyone had bought or used any oil converters, and if so what company was it? 8-)