Should I take the longer runway
You are at an airport with two parallel runways operating a jet airliner. A shorter one and a longer one by perhaps a couple of thousand feet. Both are available for departure. The taxi distance to the shorter one is a couple of minutes shorter.
The aircraft is near max takeoff weight and the takeoff performance calculation shows that at the takeoff weight for the aircraft, the short one is acceptable but it is right at the limiting weight for the runway length using full takeoff thrust.
So it is decided to use the longer runway. The only thing is that with the longer runway a derate and ATM thrust reduction is used for the takeoff along with a different flap setting.
Without including a bunch of variables such as the longer runway covers weather changes, payload adjustments, etc.......How much advantage have you gained by using the longer runway. Is the reduced thrust takeoff negating most or all of the advantage that the longer runway offers?