Here is how I came to my conclusion to go WVO over biodiesel - biodiesel you don't need to alter your existing system in your car (for the most part - not sure on seals), but you pay $2.50 a gallon here in Ohio at a handful of biodiesel stations in the whole state. MNoney goes to big companies, and you are still funding the same sources overseas you are now buying gasoline. It still has all the polutants of current diesel. Doesn't sound like ANY advantage to me.

WVO - you have to invest about $1000 up front give or take a fewe hundred to buy the system and have your vehicle converted, BUT: 50% less polutants, 90% less carcinogens, non fossil fuel, for the most part 100% American made renewable resource, you are supporting yourself, not some fat cat big business or some insurgency somewhere, and it's FREE. You are supporting the new wave of Freedom of Choice

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Love Peace and Grease

If you run several diesels it probably pays to make ONE Biodiesel processor and run all the vegicles. If you have only one the one time cost and effort of converting is only slightly more but thereafter the fuel requires much less pre-processing and the cost of WVO is essentially zero, while BD costs for methanol and lye are significant. Also, if on the road you need more fuel, simply filtering oil available everywhere is quick and simple with minor equipment. Making BD on the road requires more equipment AND significant delay time for chemical reactions and settling, washing the final product to remove excess methanol, and more corrosive product (in re: rubber seals).
But a farm, for instance, with multiple vehicles for local use only might be more efficient using BD.
If the converted WVO vehicle ever dies the kit can be removed and transferred to replacment vehicle.

Just completed my 1994 6.5 l TD suburban. Second greasecar owned by me, I too was pondering the differrence some of the major factors why I chose WVO.
1. With biodiesel you still have to obtain and filter WVO, why not just do it once?
2. The cost of Methnaol renders the final product around .70-1.00 a gallon. Filtered WVO costs me .10-.16 cents per gallon.
3.Methanol + Lye = Methoxide.....Nasty to breathe...can you say messed up for life? Plus I have kids and lye is caustic, WVO on the other hand is just messy, soap em down and hose em off.
4.As stated above, if you have a filter system and a decent personality you can score WVO from almost anywhere.
5. I can filter about as much WVO in the time it takes to mix up the same amount of Biodiesel.
6. In winter you still have to add additives or mix the Bio so it doesn't gel.
Do what you want its a free country, but you asked and I answered.

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KEEP ON GREASIN'
1998 VW Jetta, 1.9 L TDI
1994 Chevy Suburban, 6.5 L TD