747-400F with GE CF6-80C2B5F engines:
all data is flaps 20 and metric tons:
EGPK/PIK, so elevation 65msl
rwy 9500' (rwy 31 from intersection)
390.7 at 14C
389.8 at 16C
KSAV/SAV, so again aground sea level
rwy 9201'
383.2 at 14C
382.1 at 16C
in both cases, you could get another 4.5 tons by turning the air conditioning packs off for take-off, or perhaps even more when applying a correction to the specific airport, and not using the generic weight increase.