Axios works with clients in three broad verticals:

ethanol and other gasoline substitutes
biodiesel and other diesel substitutes
biomass for stationary power

Biodiesel is a near-perfect diesel substitute at any blend levels, made from oily materials such as vegetable oils, waste fats, etc and methanol, via a chemical reaction called transesterification. As of last year (2006), global production stood at about 6.0 million tons of biodiesel (1.8 billion gallons).

Axios publishes biodiesel prices online, courtesy of Biofuels Connect.