I have noticed that when I reach a speed of around 50hm/h there is definitely an audible humming sound in the cabin. It is not incredibly loud or anything but definitely noticeable. It gets slightly louder at even higher speeds but not significantly so. I also notice that as I slow down I can hear the noise almost winding down. There is no vibration and the vehicle seems to perform as it normally does. Any suggestions as to what the cause of this is?
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Your tires are not all four the same type. Probably you have different front/rear tires.