I checked my pressure factory set it at about 36-38 PSI.. (cold)

is anyone running more than this?

i would keep it the same as it was set at the factory. i haven't checked my pressure so i don't know exactly what mine is set at.

I checked my car after taking delivery and it was 35 on all 4 tires. Even though the rear is suppose to be 37 or 38, I just kept them all the same since there is nitrogen in it.

Yeah, I run 37 front and 39 rear. A little more than factory. It works for me. i have 33k on my RE050s and they've still got a few k left in them.

BTW, the factory didn't set the air pressure. Your dealer did. And the nitrogen thing is so overrated. Whole air is already 78% nitrogen. What you really want removed is the water. Humidity in the tire will upset things more than anything else.

Lobuxracer thanks for coming thru, my tires have 3 PSI variance amongst them with a needle style gauge.

How do you know the dealer sets the pressure, or do you mean they check and make sure when it's in the lot before selling to you?

I also wanted to see if I can safely run a bit more pressure since the pot holes here are really bad.

I like the nitrogen idea ... but still got to maintain the car instead of avoiding it! a little regular air mixed it won't hurt anything.

I know most cars are supposed to have around 32 psi Im not sure bout the is

^ yeah, i run 32 psi in the tires of my other cars, but on the is i'm just leaving it the way it came.

Setting tire pressure is part of the PDI. If you get the car and they haven't checked and adjusted the tire pressure, they've failed an important step in the pre-delivery process.

I run higher pressures because I spend a lot of time over 70 mph. An awful lot. It helps with tread life and handling. The factory recommended pressure is for the average driver under average conditions. If you are not that guy, you need to experiment a bit with pressures to get the best combination of tire wear and handling to suit your preferences and your wallet.

I put 40psi on all 4 tires after my TPMS went off one morning.

I was pissed when it went off because it was 5am in the morning I had to drive back to OC from Riverside. I stopped at a local gas station (still dark out). Visuablly checked all the tires, they all seemed fine. So I start pumping air. So I put 40psi in all 4 tires because I didnt know which one was low.

When this happend I was kind of disappointed in my IS. Because I barely had 3k miles on it and already warning lights came on. My previous car which was an Integra had for 8 yrs drove nearly 200k miles not a single engine check, etc. I just want my Lexus to be the same. I just wish there was a way to disable the TPMS for good. I would of done that the first time I got my car.

Yea but things are different than they were 10 years ago... Now a days cars will give you a warning if youre falling asleep (LS600) or when youve left your moonroof open, or even when to change your oil. It just comes with the time.

Let me make sure I understand you. You got pissed at your car because it let you know you had low air pressure in one of your tires, so rather than checkng the pressures and filling them to spec, you "punished" your car by gassing up the tires to 40 psi.

I assume that if you put 40 psi in the tires, you had a tool to measure air pressure. Tip: That same tool could have been used to find out which tire was low.

The light coming on for TPMS doesn't mean there's anything defective on your car...it was doing its job. Just to be clear, disabling TPMS will not keep your tires from ever becoming low on air...it will just keep you ignorant of the problem.

I was pissed bacause visually the tires didnt seem low. Also I had a 1.5 hr drive to work that day and I didnt have the time to check every single tire in the dark at 5am. The TPMS should at least let you know what tire is low. Also I hate the fact that I TPMS cannot be disabled, I would pay the dealer to remove it in fact if it were an option.

I guess it was just a bad morning for me.

I would run less pressure if I lived in an area with a lot of potholes. Running more pressure will just beat you and the car up more.

The correct inflation pressures are labeled somewhere on each car, usually on either the driver's door jamb or the inside of the gas filler door. Lexus puts them on the driver's jamb.

32psi is too low for the IS; I believe the recommended pressures are 35F/37R.

If you lower the pressure in an area with lots of potholes, you increase the chance of bending your rims. I speak from experience (not on the Lexus, fortunately).