The next debate Whunter you need to think about is
Biodiesel -vs-WVO
With Biodiesel you have to filter "and" process EACH & EVERY gal of oil thru the triesterfication(sp?) process. This means you are handeling dangerous chemicals and processes (Lye, Methanol) before it becomes a usable fuel.
With WVO one modifies the vehicle so it can be switched between Diesel and WVO via a single switch. Something you have the knowledge to do easily. Once your done converting the vehicle your pretty much done. You "only" have to filter your oil and then pour it in.
There are other limitations to both. Read through "
Journey to Forever " As you read the info keep in mind that J2F is IMHO predigious to Biodiesel and the mail list they created in Yahoo are as well. I will give credit though where it is deserved. The J2F website does have the best collection of information/data out there even though its slanted.