A few years ago I took my car to get the front wheels aligned. The alignment guy told me my tires were a little low and he said he would adjust the pressures. All went well. (This is a guy who has been in business for a long time, does alignments the old-fashioned way and does them right) A few days later I decided to check pressures at home and discovered that they were all at 50 PSI, which is the max inflation pressure on the sidewall. Needless to say I adjusted the pressures to the factory recommendation (not my Cougar but my daily driver).
I generally keep pressures on my Cougar at 30-35 PSI. (225-65R16 tires on 16X7 wheels)