I have noticed that according to my in dash display on my 2011 Silverado 1500, all 4 tires are always reading around 28- 30 PSI, the MFG Spec calls for 35 PSI, however they dont get low enough to illuminate the low pressure light.
Ive had the dealer pump them up to 37 PSI a couple times and in a few days they are right back to 30 PSI. Anyone have any thoughts?

 

A change in temperature is likely your culprit.

 

Thanks, and yes I too contibute change of Temperature, but do you think that 5psi drop affect my tire wear or fuel milage? I was thinking of replacing the air with nitrogen, do you think that may help?

 

Mine have N2, they are 27 in the garage, shortly after 3 - 5 miles they go to 30 psi. perfect

 

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JK23112 makes a great point. Temperature is usually the culprit and is normal. If this issue continues to concern you, stop by your dealer and have them check it out. Best of luck!

Louis
GM Customer Service