Most of the cabin noise is related to the condition of the roadway asphalt surface. A smoother asphalt surface will be much quieter than a more granular grainy asphalt surface roadway. When I purchased my Niro, I asked the salesman this same thing ... "the car seemed a little loud at times", and that was the explanation he gave me. Makes sense! Just make note of the asphalt surface conditions and you will notice a change in noise levels. I know the Niro is not the quietest vehicle on the road, but when i do notice excessive noise I also pay attention to the roadway surface.