Originally Posted by Cerenity

Right. Each direction must be under the MPM. Unless both directions are similar in distance, a 28K mile round trip itinerary likely has a MPM that is well above 14K. If the MPM was 14K then each direction would have to be roughly 14K (for total to be 28K) for it to work, but if MPM was say 15.5K then you could do 13K one direction and 15K in the other direction.