soon bio disel prices will be able to compete with disel, right now bio is about 3 a gallon but thats is becasue there are no pumps and most, if not all of it is transported to people by trucks.
bio burns sinifigantly cleaner and comes from a renewable reasource, you can also mix bio and regular diesel from 1% to 100% and it will burn in any diesel motor. the only down falls right now are price and at 100% bio you lose about 2 or so MPG