I have noticed some serious difference between PFPX fuel calculations and PMDG 747 actual fuel consumption in flight. Turns out that a flight of about 10 hours consumes almost 10'000kg more fuel than PFPX planner predicts (taking into account the winds aloft, weight, etc). Does this mean that the fuel flow in aircarft.cfg file are off? Is there a way to even out the two so that planning is more accurate? Has anyone had the same problem?
Many thanks!