I have always thought of film like bananas, the pro stock is just perfect yellow, not green and no brown spots, just perfect. Therefore its kept refrigerated to maintain this stage for as long as possible. The business knows this, therefor they can produced film that perform the very best during the yellow area, but they dont care about the performance during green/brown. The other market, the"amateur" market, film is produced in such a way so it perform well during the whole period, until it expires, but you wont have that ultimate performance.
So, I try to use "pro" film in a week and then they are back in the freezer (developed minimum the week after). If i dont shoot that last 2-3 frames I dont care, just wind it back and freeze it, I rather have 10 perfect frames which perfect color (I dont know, i somehow believe there is a difference in old/new film when i print to ciba...... but maybe I am just crazy
(i left out the obvious jokes, but feel free to add