This week the amusing bio fuel story is about French nonsense. Apparently the French government does not exactly permit drivers to use vegetable oil in cars, but a large number of French citizens are doing so anyway.
The driving force, if you’ll pardon the expression, is pure economics. Apparently vegetable oil over there costs around 60% of diesel by volume. I’m not sure how that figures on a BTU content basis (quick question, does anyone know if the French actually measure energy value in British Thermal Units?), or what it does to mileage. A quick websearch did not yield a good answer.
The article also suggested that there were serious technical problems as well if you used a greater than 50% mix of vegetable oil/diesel.
The EU is quite big on vegetable oil as well as ethanol as a fuel substitute, but France is not yet. They have pushed mainly ethanol as a substitute. Check it out.