26500Lbs,
I have spoken to a few 92 drivers and the 225 has better load and range. A friend who is a 92 driver told me they could only take 16 pax when the 225 could take 19 to the same destination (same weather and wind and bags) the 225 is exceptionally capable.
I hope that answers your question. The cost per NM was a rumour that i heard probably due to leasing agreements.