potman

They did that to mine as well. When I went to deflate the tires back to 32 lbs, I found one tire at 36#, and three tires at 31#

They didn't really check the tires...which makes me wonder what else they really didn't do....and I won't take it back to them. (Olathe Ford)

Chromeshadow

I thought this was also a CA thing as a result of the Ford Explorers tire issues. Many people were letting the Explorer tires run low on air pressure which caused them to become unstable.
I believe the your door pressure setting was intended for a fully loaded vehicle. If you have 5 people in your car and a trunk full of stuff, that might be a good setting. 90 percent of my driving is by myself, I keep mine at 31-33. The wider the tire the more likely you'll wear out the center when it's over inflated, and they can be a little bouncy. If you are in snow, running a little low can help gain a little traction. I'd stick with the recommendation on the tire not the car. BTW, my 2012 V6 door does says 32 psi for the 17" tires.

Norm Peterson

The pressure number molded into the tire sidewall is only the maximum pressure that the tire is rated to be safely inflated to.

It is NOT guidance for its inflation in use.


Norm

Chromeshadow

Norm is absolutely correct, tire pressure info on the tire is for max pressure. It's pretty worthless for Mustangs.

Derf00

I generally run my tires at 35 psi. 32 or 33 feels squishy and i notice more road wander. That road wander is even after all alignment specs have been adjusted to specification. 35 psi, no wander and I get more even wear between the center and outer edges. I tend to take corners fast so with a slightly higher pressure there's less tire folding on a quick turn in.

SD 197

Out of all the vehicles I've owned, the S197 has the lowest recommended tire pressure. It took me some time to get use to having them at 32, but seems to work out fine.

I've been experimenting lately though, and seem to like 33 all around. Make sure to check them completely cold, even sitting in the sun will raise the psi a few pounds.

Chromeshadow

I dropped a note to AM-I purchased my tires and wheels from them, here is what they suggested for the Nitto 555 255/45/ZR18s.

" We usually inflate the tires to 44 psi for shipping
purposes, but recommended pressure is usually between 35-38 psi. Keep in
mind you must have the pressure within specification of the TPM
sensors(32min-38max) in order for them to sync up. Once you have
successfully synced them to the vehicles computer, you can adjust the
pressure accordingly. Please let me know if there is anything else I can do,
I will be happy to help. Thank you.

Ken Cruz
CS Supervisor
AmericanMuscle.com
(866)-727-1266 x 325"

My door says 32lbs, but that is for the stock 17" tires that came with the car.

baddog671

I can never really feel a difference unless I bump them up considerably. Lately have been running 35 front, 32 rear. Still factory tires

2cokeman

Always 35 psi here, nice firm ride, no tire noise, and better tire life..........

HenryinFlorida

The Mechanic that mounted and balanced my Hankook V12 255/45-18 tires on 18x9 1/2 wheels told me to keep them inflated to 40lbs. It's only been 4 months. but I haven't seen any evidence of abnormal wear so far.