BS - Empty weight from the USN, MTOW and fuel cap from Boeing.
Of course I don't know if the USN definition of OEW. Could be +-5,000 pounds or so depending on whether they include the pies.
There's something screwy with the numbers. Per multiple sources:
Empty wt = 62.7 t
MTOG wt = 85.3 t
Fuel Cap = 34.1 t
85.3 - 62.7 = 22.6
34.1 - 22.6 = 11.5
In other words, the P-8A is supposedly flying around with tankage for 11.5 tons of fuel that can never be loaded into those tanks.
Me thinks the "empty weight" includes weapons and/or other expendables (like sono buoys?) that are not normally included in commercial OEW numbers.