I checked my tire pressure 4 days after getting the car from the dealer, fronts 28, rear 26psi. Not sure if it was for a soft ride on the test drive, or they just did not check it.
If I recall, mine were about 2 psi below the recommended. I think they were 33 psi front and 31 psi rear. I am running 38 front and 36 rear now.
Could be they planned it that way, or maybe just didn't check before delivery to you. Figure from the time it left the factory and if it sat on the dealer's lot for a while, losing a couple of psi each month, you could easily be down that much from the recommended pressure. I keep mine at 40/38 for a compromise between ride and economy.
Nitrogen can keep tire pressure stable and eliminate moisture in the tire which lowers MPG and rusts the rims. It can cost about $30 per tire. Nitrogen vs Air In Tires - Why Nitrogen in Tires - Popular Mechanics
That seems to be an "inflated" price. (Sorry, I just couldn't help myself.) Costco includes it with new tires, and gives free fills as needed to maintain them. I have a portable air tank for use in my garage, and sometimes the guys at Costco fill that from the nitrogen supply instead of the regular air hose. There have been lots of pros and cons discussed in other threads on PC. When the OEM tires on my PiP wear out, I plan to purchase replacements at Costco and then run the nitrogen, as I do in my Lexus. I tried to buy tires for my Miata there, but since it has aftermarket wheels, Costco won't mount tires on them.
I go to Costco to air up and always use the Nitrogen pump. Its free and just sitting outside the garage. I use the one in Cypress, CA.
got this little gem. gives tire pressure readings on an XP 32 bit computer 2012 Newest V7 20 041 Mini VCI for Toyota Tis Techstream Cable Software | eBay
Since 80% of the air we breath is nitrogen, it is not exactly a precious commodity. The process to make liquid nitrogen from air is straightforward and very inexpensive, and they just let it evaporate and put it in tanks. That is why Costco can just give it away. When I was in college, liquid nitrogen was used with the casualness of water.
Plus, if O2 really leaks out as much faster as the N2 cult claims it does, a tire filled with air would end up filled with N2 over several months. Either a tire is an effective N2/O2 sieve or it isn't. If it is, there is no reason to use pure N2 because the O2 will all leak out leaving close to pure N2. If a tire isn't an effective molecular sieve, then there is also no reason to use N2. N2 is a good source of dry stuff to fill a tire with, so there is some small advantage if the alternative is filling your tires in a humid climate from a thankless compressor or a poorly maintained compressor with a tank.
