Our cats and dogs live on such a diet (until you learn what the supermarket cat/dogfood really is and take them off it). Vets have been saying about all those health problems resulting from that diet.
I believe that they made the "butter" out of the leftovers (paraffin) from making liquid fuel out of the coal. So, its not a straight 60:1 ratio, you'd need to add some more products to the equation.