Do remember the fuel flow indicated is a function of current alt,ISA conditions,and a few more factors thrown in. To try and climb a modern airliner in a dirty state (flaps,gears and geardoors to boot-out) is gonna burn fuel at a rate faster than a computer can calculate !!!!
careful choice of airport in terms of Wx, r/w, appr aid etc in the first place should reduce the risk of a GA. demanding a sterile R/W should tilt the odds further in favour thus reducing the reason for GA.If you still have to then I would shoot another approach.
