If you are going to put a passenger on the dark, belted potty for 3+25, eastbound, and with a stop 5+00 westbound, be my guest. I don't do that, don't plan that way, either. Cessna says 8 seats plus a belted potty for a total of 9 passengers; add in the crew for a total of 11. Where are you getting 13? And the ZFW restriction means it doesn't matter what you say for seating, you reach ZFW FIRST!
It would be nice, if you knew what you were talking about.
GF
BTW, J_T, I think this thread is getting far off track--in fact, so far, it is out of HF range.