Exactly what I was after, your contributions are very much appreciated! I guess the next logical question would be for the 778, but with a lot more assumptions and much less hard data.
No problem, The problem with the 778 is there is no spec mission data that really passes the smell test, the range factor for a shrink should
be higher for a shrink but with the published spec mission for the 778X showing a lower range factor than the 779X I'm not sure how useful that is. There is some data flying around for actual A35Ks which would not have any potential airbus spin on them but not found any complete data to extract a range factor from a single flight that is public knowledge. There are pilots on this forum who would be able to get such data but I doubt they'd be flying for their airline much longer if they released that data on here.
155 is a bit high, all of ours are under 150
I think your are probably right (my estimates on weight put the A35k at 147.7t. I also hear that the QR ones which have a heavy cabin are at 151-152t typically.
The issue that we have is that we dont know what Airbus have used to get their Range/Payload marketing figures.