A group of my friends (here in the US) bought a school bus years back and converted it to biodiesel. They converted the inside to include 4 bunk beds,, a bathroom, refrigerator, table, and bench seats that turn into a giant bed.

I took a trip cross country with them once and I'd say we ran about 60% of it off oil from restaurants. They do it pretty much permanently, and I think they said the conversion cost them around $4000, I'd say it was paid off very quickly!

Thanks for the article!