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I had similar results as you when i used Fat mat on my diesel dodge truck. It quieted it down some but not much - music sounded better though.
I don't have any suggestion for you but remembered when choosing between the buzz of the engine noise of the honda fit or road noise the xd. Glad I choose the xd. If you do find the solution to the road noise I would like to know as well.
My guess is the tire compound and the lack of wheel well noise dampening causing most of the road noise.
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