Using the standard weights for pax, and seeing how much unweighed carry on they bring on board, I wonder how accurate the weights used for performance calcs actually are. 500kg for a fully loaded 747 represents a bit over 1kg per passenger after all.
Thanks Megan. I wonder how many out there would really do this, or just get on with it. Performance calculation is a dark art, not a precise science. It could be embarrassing if later on in the flight you needed that fuel. But cooking the brakes seems not a sensible idea.