I think Scroggs is off earning his living (bloody right too, give the rest of us some time off
) so I'll answer for him. My last NRT-LHR had a trip fuel of 100T and a Ramp of 111T. That was in September, when the winds over Siberia are quite light, - the average wind component on that sector was -17, it can be significantly higher in winter. (And that sector was on a A346, the -300 is about 20% less, from memory.)