Yes and you can easily do the same by adjusting the fuel bias settings in the fsb_aircrafts.cfg file for the existing PMDG profiles based on a few test flights to reflect your particular flying patterns (short or long haul; multiple legs, etc.). Tweaking the bias settings is a shortcut to actually having to mess with the .prf fle. Then you can keep tweaking it as you like to achieve remarkably accurate predictions, outside of the occasional variations induced by incorrect wind predictions. There's a lengthy discussion of the various weight settings over in the AVSIM NGX forum.
_________________ Jerry Post KORF
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