I know alot about how biodiesel is made...I should, as I make it myself. The highest concentration a station will sell typically is B20, which is 20% Biodiesel & 80% diesel - the B is the percentage of biodiesel. The reason B20 is the peak, is as that is sort of the magic number that a number of manufacturers has said is okay. So you'll see all sorts of biodiesel ranging from B2 to B20(the colder the area, the less B typically), and then occasionally you'll find B100.
You can run biodiesel, but it will probably clean out your system - read frequent filter changes for a while especially if you haven't used fuel additives fairly regularly. The other thing to be aware of, if it's cold, it will cloud/gel sooner - the good news is that a lot of the diesel additives work, or at least say they do, up to B20.
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