So this afternoon i went to the closest Goodyear dealer (independant) and asked about replacing the tires. he did not know anything about credit from Goodyear towards new tire but he did take down the mileage and was going to measure tread depth but noted they were all at the wear bar. after he called Goodyear he calle dme back to say that yes there was a credit but he wouldnt say how much. He claims it depends on what tire I get. To boot it doesn't cover mounting and balance which is fine with me but at $20 for mounting and $38 for balancing I am spending $232 before tires. he also mentioned that there have been reports of the TPMS malfunctioning with the GS D3's (i want) and that the handling would be very different.Anyone know about the sensors or care to comment about handling.