Well stated. Not much point getting into too much detail on this. The one thing you CAN change that will alter the total drive train loss, is using different fluids in the transmission and diff. I.E. 10-30 over 80-90 . Etc. There is much that has to be considered, longetivity of said fluid, parts, heat dissipation etc. The only other factor maybe the difference in loss between CV's VS UJoints.