62 / 4 = 15,5 rupees per square/hourFor some reason the second supplies building produces 162 while the 2x2 is 62??? So this building is less efficient than all of the other settlements second supplies? The supplies per square is only 0.5 difference from the first building, who would ever build this??
162 / 9 = 18 rupees s/h
So difference is 2,5 (not counting a possible road advantage due to the bigger building)