The Bio used in mass trans here in Portland comes from soybean farmers who were sucking wind because a lot of companies have outsourced overseas for that stuff.Personally I don't like the idea of biodiesel that much unless you are talking about production from waste oil. Plowing up more forests to grow crops to fuel cars isn't much better than burning fossil. Diesel from other plant sources like algae seems promising but from what I know it has not been put into any large scale production yet.
It's only B5 if I remember, but it's a 3 year deal with the farmers. so it helps the local economy as well as save millions of gallons of fossil. I don't remember the exact numbers, but every city bus is bio.
I have a friend that has been converting waste oil for over a year now. He doesn't keep track, but I would be interested in how much he has recycled over the course of a year or so. He sells it to a few local farmers too for a $1.75 a gallon. He doesn't use enough, so he got authorization through the state to sell a portion that covers his cost plus his own fuel.