Ive been using a TPMS for the past year that also displays the individual tire temps, its been a cool spring so I haven't had much at or over 90 degrees out side temp here and it been down in the low 50 a lot, especially after dark or early in the mornings,.
Ive found the optimum garage floor cold tire pressure to be 33 front and 39 on the back,. I'm more concerned with tire longevity then the last ounce of performance,,.
I find that with this cold PSI 33&39 setting much of the time for shorter/medium runs you end up warming up to the 36+1 or 2 for the front and 42+1 or 2 on the back which is at or a little over the recommended pressure setting,,.
One further observation on temperatures is that in the colder weather 45 to 60 degrees your running on a warmed up rear and a cold front,,. The front tire rarely warms up and never as quickly as the rear, (talking conservative city driving on cold days and not the track),,.
I should have mentioned that I was on S21 and am now on PP3, as been reported it appears the Michelin warms up quicker then the Bridges-tone,,.
I run 33 and 39 on my pirelli gt's and never have a passenger....have not noticed any side slippage yet..still have a quarter inch chicken strip on rear