At least my car has the option to choose 30 psi by clicking on the box 'comfort pressure'. And that's exactly what I use, since they get to 35 hot here in hot TX, and that's the ideal pressure for my tastes. When going to the cooler mountains I set it to 31 or even 32, but bleed some air on the way back, when it's hottest, to avoid getting them over 35 hot. If you don't have that option, do not do it, or you'd light up the TPMS warning light in a cool morning (or in the mountains).I was in my garage tonight checking my pressure and I used the door sticker as a reference. It says 33psi.