Having driven buses for 3.5 years (330 for 10 months) I was always taught to add fuel burnt (on the cruise page on Lower ECAM) to fuel on board, and to do this at regular intervals. As well as regular fuel checks against the plog. is this not good airmanship?
On another note, once in the position they found themselves they did an excellent job. I certainly crashed the first time I had my double engine failure in the sim.