how to make your own bio-diesel.  looks easy enough, but not sure how hard it would be to make larger batches, like 30-40 gallons at a time.
http://www.wikihow.com/Make-Pop-Bottle-Biodiesel
 {ehm} looks easy -- but nothing ever is.......
I could see Ryan now, getting drunk and forgetting which one was the crack mix and which one was the diesel mix. ;D
 MAN,, i aint drinking for at lease two days after last night --- i feel like $h!t today --- im poosible still drunk as we speak......