I researched this about 2 years ago and think it has merit if you're willing to invest the time and money to get it started and keep it going. I think that the main obstacle is finding a consistent source of good (relatively uncontaminated) vegetable oil from a local restaurant or two and then building the necessary equipment to filter water and contaminants and then preheat the oil before injection.
You also need to carefully evaluate your source(s) of oil. In most cases (at least that's what I've been led to believe), restaurants actually contract to have the used oil periodically removed. While they may be happy to have to have someone remove it for no charge, the oil may actually be owned by a salvage firm and you may be liable for stealing their property. Needs thorough research.....
Still, the idea of almost free fuel is appealing and let us know how you make out.
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