Had similar issues - but not wearing on one side, mine got "stair stepped" around the edges of the tire causing a thumping noise. Had the alignment checked and tires balanced as soon as I noticed this, but the problem has gotten worse. It's been in 3 times for alignment because the steering wheel is still slightly off center. This started around 9K miles, and I now have 25K on it. I decided to just live with it until I get new tires, but I'm worried that the same thing will happen to the new ones. Izusu nor any of the shops I've been to can give me a resonable explanantion as to why this happenned.