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@Ryanflynn - same here, it works best on rumbly roads. Subtle, but yes, it does work in my car, don't know about anyone else's car.
Free-space NC systems like this may never be as effective as a closed system like Bose NC headphones.
Tough problem - maybe some day.
Please don't have unrealistic expectations of Tesla ARNC - it's a work in progress - like anything worth developing.