Information On Growing Oilseed Crops

There are charts on approximately how much oil you should be able to get per acre for various crops in this PDF file:

http://www.croplandbiodiesel.com/images/clb-brochure-12-20-06.pdf

This information is nice for farmers who are considering growing their own fuel. I haven't checked the figures myself to see if they are accurate, but I assume they are.
Also there is other information and oil pressing equiptment on this website.