When under way in our '07 Santa Fe 3.3L we hear a soft rubbing sound from the outside rear. It's like a tire rubs on every revolution or a worn brake pad rubs but neither example describes the sound exactly. I just finished installing new rear pads and rotating the tires and that had no effect whatsoever on the sound. It's my wife's car and she says it's been there at least 6 months. Nothing is worn back there. Is this noise just part of the Hyundai Santa Fe character? We still have lots of warranty left.