We noticed the same highway speed vibration on our Performance from the day we picked up the car new. Dealer has repeatedly tried to road force balance the tires. It's helped a bit but it's still very noticeable. They explained to me that there is no such thing as a perfectly balanced tire and our tires are within the tolerance standards allowed by Michelin and therefore will not be replaced under warranty. Clearly not serious enough to be a safety issue, but it's enough that passengers notice it and comment on it quite often. So aggravating to lay out $70k for a new car and not get that perfect vibrationless new car ride. And it's also embarrassing when your passengers comment on it.

