I don't know what it is. My car seems to eat Continental tires. I've ran three sets of them now (2 sets of ExtremeContact DW Summer's and now 1 set of the ExtremeContact DWS 06's) and they have not made it past 25,000 km's before being worn out. The treadwear is even across the tire and I do not track my car. I've had an alignment done and everything is in spec.
Everything else about the tires is good. Dry handling is great for an all-season. Wet handling is good, no issues in deeper water. The ride is great and they are quite quiet.
I will get on the throttle every now and then and I do enjoy spirited driving, but nothing that would cause the excessive tread wear that I am seeing,
I do not recommend these tires based on the tread wear alone.