Well in my opinion, Its more worth your while to convert your truck to run on vegetable oil. I bought a kit from GreaseCar which is located 10 mintues from me. I have been running SVO in my truck for 5 months with great results. Same power, smoother running. It is much much cheaper, I pay about 2.50 a gallon, as i buy it from a pump prefiltered and everything. There are no negatives to using it at all, unless you dont filter it properly. In comparison, biodiesel around here runs close to 4.85, the exact same price as diesel.