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Both our 2017 energi and 2018 hybrid have tire noise. Both also have rusty grinding/pulsing noise very noticeable at low speeds. Both cars have had rotors replaced/milled and eventually both began doing it again. I suspect yours is rotor related. These cmax rotors rust and "pulse" often, especially after sitting for more than a day. I figure as long as ours don't get worse with speed (i.e. wheel bearing noise) and MPG stays consistent, I'm starting to ignore the noise. Greg