Biodiesel has some nice advantages, but with all the politics involved, its merits are pointless. It would be nice to have a pump with B0 and a pump with B100. If a vehicle can handle pure biodiesel and the different properties, biodiesel is useful, especially getting rid of kitchen grease, waste oils, and so on. However, most vehicles will have big issues with B20, much less anything greater... and diesels are not cheap to fix. A high pressure water pump can be $10,000. Diesel injectors are costly. A new DPF will be a few grand.
With diesel engines so costly, it would be nice to have fuel stations at least respect this and have more accurate posted stats of biodiesel.