I expect biodiesel fuels pollute more when they are burned (and they have some downsides in the production side as well). (Someone around here was driving his

I expect biodiesel fuels pollute more when they are burned (and they have some downsides in the production side as well). (Someone around here was driving his old Mercedes using leftover fries cooking oil from a local McDonald's. He had to stop it, but not due to pollution, but for tax reasons. The government really hates losing that revenue.)