Misd-agin:
Thank you for the link to that interesting publication. My observation would be that the graph on p7 (fig 1) is a generalisation for all Boeing airplanes and may not represent the B777 exactly. In my company there was talk of raising the normal cruise to .85 due to the relatively low drag penalty, although that never happened. Whatever the actual figures are, RTA appears to be restricted to the .815-.855 range.