Finally, comparisons are established between the mean of consumption of the mills to verify potential significant differences between them. Starting from the experimental design the effect could be measured, in terms of the differences of the mills as a factor over the energetic consumption. Besides, it was determined that despite of the similar behaviour between both group of assets (The mills SAG 16, Ball 16A y Ball 16B with respect to the group of assets SAG 17, Ball 17A and Ball 17B), exists difference in the energetic consumption between the mills of a same group (of Ball and SAG).