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What's really interesting is that the vibration/humming is so consistent for me. Its between 65 and 75mph and as you mentioned its on really smooth roads. Shifting into neutral at 70 doesn't change it, nor does pressing the brake or accelerating. Its incredibly consistent in that 10mph range...

I have a 22' A91 CF Edition that is completely stock and is exhibiting the same issue. Dealer thought that the car had shipped with a bad set of tires and after replacing all four, still no luck. I am going to my local trusted shop this weekend to do a proper alignment and road force balance to...