I remember reading an article in the farming press about three years ago about a company who made an interesting device. It was a combined press and furnace. The idea was that you supplied it with canola seed, it extracted the oil and then burnt the "meal" in the furnace to provide home heating with the oil left for running a diesel.
If you are interested in oil extraction from canola seed do a google search for "screw press" and it may throw up something.
Having said all that I am struggling with the economics of it all with mineral oil at around $50 a barrel.