So is bio-diesel bad for the vehicle? There's some fuel out there called "grassoline" that's basically vegetable oil for use in diesel engines.
I was actually reading about biodiesel on the net last night, it is actually better for your engine than regular diesel, and can be made at home three different ways.
Fuel lubricity of the 80/20 biodiesel blend in a little better than straight diesel. There is also no problem that I have heard of with cold weather gelling of the biodiesel blend - there is however with straight biodiesel.