Heh, I think I might need to change over to an A340-500.
I was just reading Aviation Week and an ad for Airbus said that an A340-500 has made a 9000nm commercial flight from Singapore to NYC flying east to west.
So a commercial flight, chasing the earth's rotation and probably having to fly at crummy altitudes in order to avoid the jet stream, managed to do a 10,000 statute mile flight. I wonder how much fuel he had in reserve.
Actually, I think the 747-400er would probably still be the better choice, because it probably has a higher max GW and max thrust.
Your fuel calcs also don't take into account shutting down two engines once you get to cruising altitudes. Navy ASW pilots do it all the time in a P-3 Orion.
Just a thought ;-)