I own a 2012 Malibu (1640miles) the other day (about a week ago) i received an email from onstar diagnostics telling me all 4 tires were reading 27psi, i had my mechanic bump them up to 31psi, all was well until I was looking over the systems info buttons on the steering wheel, the info center said my tires were now reading 28 psi i live in the east coast (Boston) and we've had some chilly mornings already, i was told this 28 psi reading is a cold reading and it is therefore "normal" is this the case or do i need to have it looked at, i do realize pressure can change and weather can have ALOT to do with it, anyway hopefully, Thank you in advance.
PS : The TPMS (tire pressure monitoring system) light is NOT and has NOT come on , not once, so my way of thinking is why is the pressure going down, should i take a ride to the gas station and bring the tires up the pressure or leave it alone and call the dealer in the morning, quite frankly i would rather take the ride but playing it safe and give a call to the dealer would be smarter i think, who knows, to think i just bought this car about 5 weeks ago.
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"Don't compromise yourself, you're all you have "
Location: Physically in Norhtern VA, my heart is in SW Virginia.
A lot of people will disagree with me but I run my tires + 5 psi over spec. A bit firmer ride. But the payoff is it handles better in all conditions and the outer edges last a lot longer plus better mpg. My wifes van has the nitrogen fill and it does make a difference to maintain tire psi at a more even tire pressure with the temps getting colder. I check and set as needed my tires weekly. As for the moitor if the lights not on I would worry about it. Info over kill. I would be concerned if one tire changes pressure and the others dont. Manufacturers spec the pressures too soft as they want a soft smooth ride for first impression. I spoke with a tire engineer in Greenville South Carolina and he said +5 psi really gets you where it should be anyway. The pressure spec is decieded by the mfg and they dont carry the tire warranty liability so they will go with a pressure that will boost the image of the product.