Data from a B767-300 in Pax Configuration.
DOW = 91.044
MZFW = 133.807
MTOW = 184.612
MLDGW = 145.149
Believe you would NOT be able to carry 50 tons.
42.763 Would be the Max PayLoad (133.807 - 91.044)
The difference from MZFW to MTOW is: 50.805 kgs
which is the amount of fuel you can uplift
(runway performance permiting ... for the take-off)
Given that the bird burns 5 tons/hour (roughly),
you can do a 9 hr sector (roughly) with 42.7 tons
of PayLoad.
The Cargo Configuration is likely to be lighter than
the Pax Configuration (me thinks). The difference
would be additional PayLoad you could add to
42.7 tons permited on the Pax Config.
Ready to be corrected, in case I'm wrong!!!
Safe flights,
Zero