I'm pretty new to biofuels. I just bought a 1985 E350 with a 6.9L and C6 auto trans. I have 2 fuel tanks, so have been running a diesel/WVO mix in one and warming up/shutting down on diesel. I am planning to make some modifications so I can just run straight WVO, but I am still in the learning process. Since it's nice and warm in NOLA, I can run pure WVO with no mods in the summer.
Oil is pretty easy to find...no one has really caught on down here in the backwards south, and they are always looking to make a buck, so are happy to fill a barrel for me.