Pork, the Other Alt Fuel Now Playing: Brahms Topic: Alt Fuel A biodiesel refiner in Australia is living high on the hog -- and the sheep, and the cow. Australian Farmers' Fuels is turning the fat (tallow) from animal carcasses into biodiesel. According to the Australian, it takes about a half dozen dead sheep to fill a tank, while a cow gives the most mpc (miles per carcass). This gives new meaning to the road-bound lifestyle as being "on the lamb." Intresting?