Don't know squat about diesels. That said i do listen to a little Willie Nelson.Right now I'd be wondering if this guy is a nut job too.
Bear with me a minute tho. A while back old Willie bought into the bio-fuel thing big time. Read the article with several links.
“On the Road Again”
The gist of it is that you can run this in any diesel. It is a completely renewable energy source. The only hold upto widespread distribution is the fact that it tends to gell at a higher temp than conventional dino diesel. It would reguire heated holding tanks at the filling station.
Bio Diesel Primer
National Biodiesel Board
Hawaiis Proven Alternative Fuel