Hey guy!
Our temps have dropped at night (from the mid-60's to the mid 40's). The last few nights I have driven my car, the tire pressure monitor has illuminated. Visually, the tires look fine. The light does not come on during the day. I have had my car for only a few weeks... is it possible that the air level is close enough that, during the colder evening weather, the pressure level decreases enough to make the sensors go off? What should my tire pressure be on an 07' Camry?
Spence

The TPMS will light up if any tire drops 25% of it's pressure. Tire pressures change roughly 1PSI for ever 10F change in temperature. So yes, a 20F drop could cause TMPS to alert you.

What should your tire pressure be? Well you will get many answers. The door jam says 32PSI. The manual says 35PSI if driven at higher speeds. I have run mine at 42PSI on the front and 40PSI on the rears for over 25,000 miles. Tire wear is very even. Tread depth is at 7/32 on all four, and was 10/32 when I bought the TCH.

I find 32PSI gives a "squishy" ride - when cornering, tire roll affects handling. At 40PSI the TCH handles like a different car, much improved cornering and braking. The tires also last longer at 40PSI.

In my opinion, Toyota recommends 32PSI for a soft, comfy ride, not for handling or tire wear.

I agree with Nash. I initially ran my TCH factory Michelin Energys at 38 Rear and 40 Front cold as a concession to Pacifc Northwest wet weather. I have since gone to 40/42 for the winter when the cold temps for tire inflation are even colder. I will probably go back to 38/40 next summer again. Tire wear is very even and it looks like the Energys will be good for at least 50K and quite possibly more.

It is the ignorant among us that will eventually destroy us all.