I had read some cautions about high tire pressures on new vehicles before I bought my Z a few weeks ago. I had a good quality dial-type gauge in a small gym bag with some other stuff I removed from my trade in, so about a mile from the dealership I pulled into a gas station and checked them. All 4 tires were at 44-45 PSI. It was also a day with temps in the high 90's so I bled them down to 38 lbs before hitting the freeway for the 110 mile journey home. The next morning I checked them and all were at 35 PSI. I did have the TPMS go off one very cold morning on my G35 Coupe. Kind of freaked me out. I got out and checked and all 4 tires were down to about 26 lbs. I believe the Infinti threshold was <7 lbs below recommended would trigger it.
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