http://journeytoforever.org/biodiesel_yield.html
What struck me as interesting, is far and away the greatest way to harvest Biodiesel is via Algae. Check this out, there's a great write up, and I hope we can overcome the Soy/Corn Farmer special interests bloc and look into this.
http://www.worldchanging.com/archives/003999.html
A single acre of algae ponds can produce 15,000 gallons of biodiesel -- in comparison, an acre of soybeans produces up to 50 gallons of biodiesel per acre, an acre of jatropha produces up to 200 gallons per acre, coconuts produce just under 300 gallons per acre, and palm oil -- currently the best non-algal source -- produces up to 650 gallons of biodiesel per acre. That is to say, algae is 25 times better a source for biodiesel than palm oil, and 300 times better than soy.
The other paragraph that blew me away and should be something we spend our hard earned tax dollars on immediately, especially in polluted urban areas is this:
Isaac Berzin has developed a method of capturing CO2 from smokestack emissions using algae, and turning the result into biofuels including biodiesel, ethanol, and even a bio-coal substitute. His process, based on technology he developed for NASA in the late 1990s, captures more than 40% of emitted CO2 (on sunny days, up to 80%) along with over 80% of NOx emissions; in turn, it produces biodiesel at rates-per-acre that could make a full conversion to biofuel for transportation readily achievable. Berzin's company, Greenfuel, has multiple test installations underway, and expects to have a full-scale plant up and running by 2008 or 2009.
Not only does this help us clean things up, it creates Biodiesel from the waste we are capturing.
Cool stuff.