Bio-Diesel: This is a form of fuel that can be derived completely form vegetable oils with minimal further processing. It gained a lot of popularity in the 2000s. Most of the currently found bio-diesels are in a blend with traditional diesel fuel. B20 (20% bio-diesel, 90% diesel) is the most common though it can be found as high as B99 (99%bio-diesel, 1% diesel). Warning: bio-diesel has been known to deteriorate rubber seals it contacts. Axiom Diesel Cycles are not set up to run this fuel at this time.