ok, thanks for the info.
i undertsand it would be almost impossible to gain a figure from looking at the gauges at the landing stage as you've already mentioned that they're not that accurate nor can you determine the exact fuel figure at the instant you touch down visually but there must be some figures out there some where.
i'm sure boeing know the answer but i was hopeing someone here might know a rough figure...this is based on good landing conditions. light wind, dry runway, good LDA. how much can i expect to save approx?