Diesel is the easeist to convert, after all Diesel's original concept was a cheap reliable engine 'For the Masses' and ran on Peanut oil. Sunflower Oil I was told by veg oil experts is actually the most volitile. As that what told to me whilst watching a 150 ton drum drier going up in smoke, I'm inclined to believe him. :-D
You know with all the 'Dangers' that seem to be being found latley I think it a wonder I've lived so long. For instance I don't drink alcahol, which all the Consultants I've seen over the last year (Another Story) have said great ideal for the treatment you need! But this morning a Danish bunch have announced that their statistics 'prove' I'm 30% more likely to get Diabties by not drinking.
What's happned to Hydrogen by the way? Part of selling London for the 2012 Olympics was a trip on a Hydrogen Powered bus. There were two at First Group up North London, great things went a like a rocket very reliable drivers and passengers liked them. Problem was, they were so quiet, people didn't know they were coming. I've bene told one company has been told stop using hybrid buses in one area as because they make no noise moving off people are walking under them. . Unexpected consequences.