well i got a 96' f250 ford 7.3 powerstroke fuel injection, and im wondering how much will it cost to swtch to biodiesel, ill be using my own gas tank as it has 2 tanks, but im just wondering what it will cost to convert it, as diesel is 4.60 now, i aslo get 15-18 MPG, 18 MPG with a diesel additive, which i thing thats good