I'm sure this has been posted before but...I have owned my EVO for 5 months and didnt really bother to look at the tire pressure. I read on here how they were coming over with high PSI. The door jam says 32PSI front and 29PSI rear...Checked mine today at they were 40PSI for all 4 of them

 

I think they put in about 40psi in a tire when they're mounting it, to seal the bead or something. The last few tires I've had mounted have all come back to me with way too much air in them, usually right around 40psi. Also beware if you have a shop or the dealer do the rotation, you may wind up with 29/32 instead of 32/29.

I usually check my pressures every few weeks, just out of paranoia. I checked them yesterday morning and they were like 29/26, so I pumped them back up to 33/30.

 

Just checked mine...they are all around 29-30 PSI...I'll have to throw a couple pounds in next time I stop for gas...

 

Mine was delivered with 47 psi but I checked the tires within a few days. When I confronted the service manager he said a lot of the cars are shipped with high pressures but he didn't say why.

I have two guesses:

1 . Some cars might not sell for a long time and boosting the pressure is a way to be sure they don't go flat waiting in a storage yard.

2. Maybe it helps prevent flat spotting.

 

When I got mine they also had around 40 in them.

 

The high tire pressures may also help to raise the chassis heights for transporting, they also put spring rubbers in the spring to raise them for transport. So height must be an issue on a car hauler.

 

It is (trust me, that's the only reason the spacers are there and some cars still get underside damage...but I digress). Keep in mind with tire pressures that they also change with ambient temperature. A rule of thumb is 1 psi for every 10 degrees F so it pays to check them often and set them only when cold (driven less than a mile or so). Of course, never bleed air from a hot tire (immediately after an extended period of driving) either.