dragon man,
If you do not mind a few questions:
What was the mandatory fuel for the 380 in comparison to the 400? My understanding is that many en-route alternates which work for the 400 do not work for the 380, hence requiring large build-ups making it effectively an even heavier aircraft. Is this true? If so, did you factor the weight of the extra fuel into the burn per kg.
Surely, the 380 is better than 1% more efficient than the 400 without extra weight from mandatory fuel or extra belly cargo. If not, the 748I is going to absolutely kill the A380 program.
Cheers,
cxorcist