The TriStar fuel consumption was certainly well above that expected of more modern types, but 9 tonnes/hour sounds far too high to me. Maybe at TOC with a heavy aircraft? My memory is of an average in the region of 7 tonnes/hour for a -500 though I have to admit my memory dates back over a quarter of a centuary .
Looking at the TriStar blog I see that Orbital Sciences continue to use their L1011 as a satellite launch vehicle and this is said to be the only L1011 currently active. Does this mean those aircraft used by shadowy Middle Eastern operators on UN charter work have finally been grounded ?
The TriStar Blog also mentions that an attempt was made to revive a L1011 at La Ceiba,Honduras, for a ferry flight which appears not to have happened. Presumably this is the aircraft that was involved in 411A's last flight which was well discussed here a couple of years ago