What about a diesel running of french fry grease?
I saw the recipe and the apperatus for making biodiesle is pretty simple.
e.g. 40 US Gal + 5 US Gal of Methonal + Lye (NaOH)
Mix well then drain the glycerin that is produced.
According to the USDA and the farmers around here that are running it, it burns cleaner, cheaper and they get a HP boost.
The salt mines around here have switch all their equipment to biodiesel.
Johnny