Aye aye aye aye
The pack output doesn't change
WRONG,it has a scheduled output,an optimum but it reduces as the cabin goes higher.
Here is an explanation of how the pack reduces its airflow as cabin altitude increases.
Again AMM:
The high flow servo is selected when solenoid “B” is de-energized, low flow is selected when solenoid “B” is energized. As cabin altitude increases, a bellows expands and biases the servo spring balance to produce a lower airflow rate.
The recirculation help in this condition by increasing airflow,ventilation at higher cabin altitudes!
As cabin altitude increases,packs that need to keep as close to an optimum air flow,let more bleed into the upstream sense port.
More bleed means more fuel..as minimal as it is..
Really, last time I even provided you with photo evidence (the max altitude discussion). You just disappeared from the discussion. I assume you will do the same this time
How about it?you like to fly with close to max,at max or above? What was it?