[wludavid]

So we know (according to Tire Rack anyway) that a drop in 10 degree F is worth about 1 psi in our tires. Meaning if I filled up my tires last week when it was 75* to 31 psi, then right now at 35* they should be at around 27 psi.

However, what happens to tire air temp at speed? How does a lower ambient temperature effect the air inside the tires after they're warmed up?

I ask this because if the ambient temp dropped 40 degrees since last week, common sense would say I need to put 4 more psi in the tires today. However, say normal tire temps are about 135 degrees (i'm just making up a number) when the ambient temp is 75. Are normal tire temps still 135? Or are they 95? Or somewhere in between?