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I have a 2008 GMC Acadia and as I went to Wawa’s to fill my tires up with air I set the setting to 38, as I seen on the screen the pressure was going down from 60 to 38. Am I doing something wrong?
 

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35 PSI cold.
1st thing in the morning preferably-- before the tires have warmed up.
Once you start driving- that 35 PSI can go up to about 40.
once the vehicle is parked and cools off-- should return to 35.
If youre seeing 60--- they were way overfilled.
 
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