If I remember right there is a method for converting used cooking greases/oils into crude biodiesel...the whole "My Jetta smells like freedom fries" thing. I would not expect it to run well in a more advanced diesel, but would expect it to run OK in a multifuel engine or older conventional diesel.
As long as you would have a number of restaurants/kitchens/rendering locations nearby, you probably could make a fair amount of it, at least in the context of a T2K 1998-2002.
-Dave
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