Tires don't hold air forever; they just leak less if there's no holes in them.

Seriously though; why not check to make xure that the tire valve is good and tight within the stem... I've seen them loose, and that never works out as a way to keep air in a tire!
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2010 Blue RT Audio & Convenience model Se-5 transmision. Dealer-added foglights, accent LEDs and extra speakers. Some RTS chrome windshield, front spoiler and top trunk trim, RTS frunklight and frunk liner, Top Trunk liner, Chrome lower air deflector, fendertip LED bulbs and ISCI floorboards added by yours truly...