Had that issue during the first 10,000 km of driving. The 40,000 km since then have shown no extra wearing on the inside anymore (and I am still on the original 21 inch tires!). The difference? During the first 10,000 km the air suspension was on automatic, and the car went to the 'low' setting during all my highway driving, which is a lot. This was before the software update. Since then I have not driven in 'low' anymore and the uneven wearing of the tires is an issue of the past. I suspect the low setting puts too much pressure on the inside of the rear tires.