[raybb]

60kg of coal per 1kg of butter. You need about 3kg of meal for 1kg of chicken. 1.7kf of feed per 1kg of edible crickets.

https://en.wikipedia.org/wiki/Fischer%E2%80%93Tropsch_proces...

[thinkcontext]

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.