This by no means is a perfect method, or the best way to do it, just an easy Way to learn for beginners to get into this. Consider it a first step to living a GREENER life.
(this instructable is a continuing WIP so the more we share and learn the more it will be updated, please try to keep the criticism "constructive")
Step 1: Must have a deisel engine
Heres the v-dub tdi (turbo diesel injection) but others i know that have been done are Mercedes, Seat, Volvo, dodge, Chevy, Ford, Toyota, ect ect ect ect
So even if you don't have a diesel car, Take the one your driving now and trade it for a diesel car, its an investment in the earth and our future.