Just a quick little updated. My wife drives this car and noticed some vibrations a few weeks ago. I drove it and verified it. I thought it lost a wheel weight or something. Well, a few weeks go by and I get to looking at it. I replaced all the tires with my set of snows for trouble shooting, and the last one I pulled off looked like this:
Thankfully, I have a spare tire handy and I'll just have it mounted on the wheel. I wonder how much that effected gas mileage?
It did get significantly worse in the two weeks that she was still driving it. In my testing the other day, I ran it up to 45 mph and it was vibrating the whole car pretty badly. Its so nice to have it driving smooth (on the snow tire for now)! These tires are pretty old, cracked, and have been run at fairly good pressures. They're also at the end of their life and this was going to be their last season no matter what.