I dont know how many of you have diesel cars or trucks but if you do this is for you. One of the guys I work with converted his detroit deisel to run on 100% soy bean oil. Conversion kits are about $3000 for a big truck less for a small one. Diesel fuel in our area is $3.20 a gallon. Soy is $1.90 delivered in 750 gallon totes. He gets 2 miles to a gallon better fuel milage, no smoke at all. We average about $750 a week in deisel per truck, it is a saving of over $70 a day in most cases. The engine has to have a small diesel tank for start up. Start on diesel and when the engine temp hits 180 degrees throw a switch and it goes right to soy oil. I drove this truck and its smoother then on diesel, quieter, and no smell. My Mack is going in for conversion in the next few weeks. I have to wait in line so many truckers around here are switching over. Just a thought. It also works on any other engine that is diesel.