A lot of it depends on the tire rubber compound. A softer rubber compound will give you tremendous grip, but wears much faster (tires are labled as "Summer" tires).I am only getting about 10K miles on a set of tires. The dealer can't figure it out. They kept saying that the alignment was perfect so it must have had defective tires. New set is showing wear after only 150 miles. The problem is only in the front and I am either loosing chunks of the tires or both are wearing on the outside edge only. So far the dealer has covered most of the cost. 2014 Touareg X.
Could this be a bad stepper motor?
Touareg's are notoriously hard on tread life. Personally, I think a lot of it comes down to the fact that factory tire pressures are too low. I run mine at 38/42 F/R instead of the 33/38 that is recommended and it solved my uneven wear issues.
All that said, no way your tires should be shot at 10k. Assuming you don't track/autocross it, the first things I'd look at are rubber compound and tire pressures. After that I'd look at alignment to include camber and caster.
I hope that helps.