KenV - you're getting your MEWs and OEWs confused.
You're quoting MEWs - and you need to add the AAR equipment, seats, paint, galleys etc. Publicly available OEW figures range from 274,000 - 300,000 Lbs.
Ummm, no, you are dead wrong. I provided OEW data, not MEW.
OEW includes everything to "operate" the aircraft except usable fuel and payload and includes lubricants, hydraulic fluid, trapped fuel, OLE (Onboard Loose Equipment, like fire axes, O2 masks, O2 walk around bottles, cargo rails/rollers/locks, tie down chains/straps, first aid kits, etc), survival equipment, the flight crew, the flight crew's baggage allowance, etc, etc.
The bottom line is that the A330-200 is 20.5klb
under its MTOGW limit when full of fuel. Unless the aerial refueling equipment on the Voyager weighs 20.5Klb (which is certainly possible, but seems highly unlikely) then the Voyager should not be able to reach its MTOGW limit with just fuel alone. Conversely, if the Voyager reachs its MTOGW limit with fuel alone, then its OEW must be 20.5Klbs higher than a typical A330-200.
Howewver, none of you Voyager guys have ever cited the Voyager's OEW, just its ZFW. OEW is well defined internationally. ZFW (generally) includes
everything (
including payload!) except usable fuel. ZFW varies greatly for every mission. With no payload ZFW equals OEW and ZFW can go all the way up to OEW + max payload, with max payload usually defined as the numerical difference between OEW and MZFW. MZFW is a structural limit determined by (generally) max fuselage bending moment on the ground and (generally) max wing bending moment in flight. Although related, MTOGW is another structural limitation defined quite differently than MZFW.
If the definition for ZFW you Voyager guys are using is the same as the general definition, then
there is your problem. You are including the payload weight, which for the A330-200 is 20.5Klbs at max fuel. I have no idea what it is for the Voyager and may be more or less than 20.5Klb depending on the Voyager's OEW.