hey guys, i am a little confused about how much pressure i should have in my g35 auto.
on the door it says 30 psi front and back, but when i checked my tires using a digital gauge for the first time today i found one of them having 42 the other 3 around 39, so i let some air out so they are now all around 30, but i am a little worried maybe i let too much out.
Is it correct that i should have 30 in my tires?

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G35-Forum.com

 

Generally a good rule of thumb is to keep the pressure about 10% higher than the recommended one. Reasons are: one, losing pressure is directly related to time, speed, temperature,etc. Therefore, at 30lb, your tires are running underinflated quickly.Two, it is always better to run at slightly overinflated than under. I have been doing it for a long, long time. In conjunction of periodic alignment, my tires last for a long time. I fill mine at 33. Hope this helps.

2004 G35X

 

32-35 is good for driving around town. 38-42 is autocross/track day pressure. It rides way too rough for regular street use.