Boeing quoted to me MTOW = 348T; OWE say 147T; 300 pax = 30T; max fuel = 162T including the three 1850 US Gall tanks in the aft compartment. That gives you 339T at brake release with no freight/excess and 348T with 9T freight/excess. Or to put it another way either 177T or 186T ZFW. In still air they said 9250nm in that config and were confident that a little improvement was in hand. I seem to recall L888 as a route mentioned that was okay as regards driftdown but its a bit longer than a GC route. So it close but maybe no cigar yet.