B20: Term that refers to biodiesel-diesel blends containing 6% to 20% of biodiesel.

B99/100: The highest-level biodiesel-diesel blend containing between 1% and 0.1% petroleum diesel.

Biodiesel: Diesel fuel derived from vegetable oils, animal fats, or recycled grease. Chemically distinct from petroleum diesel.

Diesel: Diesel fuel is the common term for the distillate fuel oil sold for use in motor vehicles that use the compression ignition engine named for its inventor, German engineer Rudolf Diesel.