How do I convert to biodiesel?

I have a 1990 Jeep Wrangler. I drive A LOT, and half of my paycheck goes to damn Gas & Oil companies. Ive been looking up info on biodiesel and it sounds like the way to go. I need to save money, and help the environment. Is there a way of making my Jeep biodiesel? And how much will this cost me?
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