Current
350-1000 driver here
Is QF getting these aeroplanes with extra tank capacity?
Max fuel is 124.6t, MTOW 316t, DOW is about 155-156t, hence payload available is around 33t give or take.
At 6.5-7t per hour this is going to get very tight, especially in JFK with frontal thunderstorms in summer or snowstorms in winter
Good news is that out of SYD or JFK even on a hot day you can still make it at MTOW