Hi Earl
Had the pleasure to work with the L1011-500 during the mid-90's, routing South America-Lisbon. All in all nice birds, but rather temperature sensitive (payload restrictions kicked in heavily after 25/26°C, minded, we were on at 2500ft elevation).
I also remember that when we upgraded(?) to the A343, and comparing both types, the fuel burn of the -500 was more or less the block fuel for the A343, with the latter loading more SLF and cargo.
BF