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They had a writeup on this in Car and Driver awhile back. The main problem is that vegetable oil / canola oil, etc is too thick at "room temperature." It tends to clog up the fuel system. You have to heat it up first so its viscosity goes down. What most people do is run the engine on diesel fuel for a few minutes at startup to get things hot, then switch over to biodiesel with a switch near the driver's seat. About a minute before they shut down, they switch over to regular diesel again to clean out the oil from the fuel system. Interesting technology, but kind of a PITA if you ask me.
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