forget, the aleged fuel penalty of 4% comes from BOAC, quoting a post from heli-mate, which I suspect has been mis-understood.
Actually the port winglet has been missing for a few weeks, and whilst the general handling is not affected, the port-side fuel burn has increased by 4%! No, not really, but that is the sort of comment I could expect.
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The A330 CDL, as quoted by yourself, shows a fuel penalty amongst other operational limitations; of 1.2%