Didn't even know there was a company in my backyard that produces conversion kits for diesels, greengreasemonkey.com was on the local news tonight. They sell a conversion kit for about $600 ($1200 installed if desired). I can get my hands on an old M-B diesel sedan for cheap if I want it, all I know is that it runs, drives, and has passed inspection. Now I am actually considering it for an around-town car. With all factors considered, would a 20-year-old diesel converted to vegetable oil be a great deal cheaper than continuing to use my V6 Explorer for local trips? I have no idea of the reality of owning a vegetable oil-powered vehicle so I don't even know what costs and considerations to factor in.