I have rotated the tires every 5k miles on my 06 XLS. I just had them rotated on the 15k service and asked for a balance because I was getting a littel bounce on the highway. They said the front right is twice as worn even across the tread as the other tires. Is this the traction wheel? I'll be lucky to get 5k more out of the one tire. They suggested rotating in the new spare wheel on the next oil change. That way I can get about 10k more out of the remaining tires. DO these Bridgestones stink or what?