I have a 2010 3 iTouring with factory Bridgestone Turanza tires that are starting to cup on the insides of both left side tires. I have 40K mostly highway miles and there is still enough tread left for another 15k+ miles but the noise and vibration is not going to allow me to get many more miles from these tires. My question is this common with these cheap factory tires as i have not encountered any thing that would have caused an alignment issue. Thanks for any input...