Nice one helen!!
Once more: Not talking yield, but simply download the flightplans of the parallel flights to a couple of destinations.
If you are capable of calculating and extrapolating, then you will see why the 380 is a gas guzzler.
You may add fuel to reach the West Coast, but you need to add around 35 tons to add 1 hour of range ..... Is that worth it?
The beancounters are not stupid, neither is Airbus. If they can make money, they'll serve the WC with the dugong.
But concerning efficiency and fuel burn, I will admit an apology here once I will see a 380 flightplan to LA with the same ratio-numbers as a 77W.
Until then, I concur with fuel guzzler.