To me Fedex runs their flight into Memphis like a Las Vegas crap game. Pick any flight and the company runs that flight with minimum fuel overhead. They have already costed the flight out and can predict how much that flight will make the company. If a Captain is not comfortable with that number and adds gas, so be it. I always feel like the company is saying , OK we were going to make x on that flight but now it will be y. However on some nights the company's plays their hand with min fuel across the board and when a storm comes rolling in they lose. BIG TIME. Ever wonder why the MFOH is so low around the October time frame. I always taught that it was due to the fact that the summer thunderstorm season is over and the winter crud as yet to arrive. It was later explained to me by an Airbus instructor that while that may be true it's also the end of the second quarter and the company is padding fuel numbers. Like a casino player you don't have to play every hand or Engage in every roll of the table. If you don't like the fuel number add gas.