Dr Christian Koch, 55, from Kleinhartmannsdorf, has a special method for turning household garbage into biodiesel. This leads me to believe you can make biodiesel out of just about anything.
So, his method involves heating stuff like old tires, paper, motor oil, plastic, dead cats, just about anything, to 300 degrees Celsius. Then the hydrocarbons go through a catalytic converter.
Now I'll know what to do with all those dead cats in my freezer! (JUST KIDDING)
Found Here and Here.