Well I guess other than the smell it's not really got a drawback. Unlike Biodiesel that's raising food costs and starving more people.
I hate to be negative, but surely if the bus goes boom, and injures someone, with you having done the work that makes you liable....?
Dont Forget to pay your FUEL DUTY! As tax evasion is really frowned apon.
Good luck with the conversion. Sounds like a really interesting project. The kind of project school's doing the motor vehicle nvq's should get their pupils to get involved with......instead all motor vehicle pupils and instructors seem to end up doing is stripping repairable motors with no intention or knowhow of putting them back together.
No chance, thanks to Jamie O it's all this healthy rubbish now.