spannersatKL - No, I understand fully the RR/PW EPR (IEPR) scheme.
I'm merely saying if you set EPR on a warm day and note the N1, then set the same EPR on a cold day and note the N1, you will come to the conclusion I stated: When the air is more dense, it takes less fan rpm to achieve a given EPR.
The air doesn't care who makes the fan.