SMTmember,
I operated HKG to CVG on 09Aug11, one of Atlas' B744F aircraft...
Here are the real numbers...
WEIGHT ACTUAL
BOW 160768
SWA 000000
PYLD 047500
ZFW 208268
TOGW 366451
LDGW 218370
That said, the 15hr11min flight had a burn of 148,081 kgs of fuel, and we blocked out with a fuel load of 159,500 kgs.
All that is fine for what it is...but it does leave 30T of weight (fuel and additional cargo) that we COULD have carried. Our B744Fs have a MTOGW of 396,893 kgs, and therefore the 30T that we could have carried in fuel and more cargo.
Not having the real numbers for a B777F makes the comparison virtually impossible...but 40% seems to be too good to be true.