Actually
The Concorde's goal was to 'make passengers forget they're flying' too, with the less time in the air and in luxury.
I haven't seen any A380 fully loaded burn rate data. Do you know of any other than Rolls Royce testing of engines on the ground?
I agree about the contrails, makes it difficult for us sky grazers too, but the A380 will not reduce them. Think of all the jumper connecting flights that will be needed due to only 60 airports worldwide who can service the A380. Eliminating contrails would be the preferred goal if you ask me, just as I don't want bigger trucks on the roads.