Hello Steve:
Our 2002 PT does the same thing. I don't consider it to be whining. Our PT "sings" a most heavenly note at seventy mph. Sometimes it is a smooth even pitch. Other times it has a "warble". Can anyone deny the car has personality, & is happy on the road? I discovered I can duplicate the exact same pitch by rubbing the wheel cover with a wet chamois. (This time of the year I run stock wheels & Winterfire snow tires, from TireRack). My assumption is that at certain airspeeds the airflow between the brake rotor and wheel/wheelcover sets up a harmonic. I don't notice it as much when I have the stock chrome wheels installed. Good luck.
Den.
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