Bio diesel works fine most of the time. It tends to clean out your engine so you need to carry a fuel filter just in case. It adds lubricity for sure. The greatest limitation is that in cold weather it may start to gel sooner than D#2. People that run B100 add a pre-heater to their engines. Most people run B5 to B20.
Some day conventinal fossil fuels will start to disappear. Then we will be running on biodiesel made from many different sources including algae, crops, and waste cooking oil. When diesel fuel gets to about $5 a gallon, biodiesel will be very competitive and it will be readily available.
I liked ductape's comments.
