I agree with the information about JTF with this subject (among a few others...)

VO or WVO will run fine, IF you heat it. Otherwise, it will be too thick to run correctly. You will have a little less power and a little less mileage, but you will also have a little less pollution.

There are a number of websites that will tell you how to run straight VO, or WVO, but the bottom line is that is will fun fine, but only if heated.

you might look at http://biodiesel.infopop.cc/eve/ubb.x?a=tat or http://www.fattywagons.com for some more information. You can run a blend, like was mentioned before, and it will help with the lubrication and cost.

check out the Bio part of this forum for more.