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I had continental DW extreme contact summer tires and dunlop both worn out not over 10k
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The summer tires are a good bit softer than the all-seasons, but 50k miles seems like a REAL stretch to me.
The tread ware rating is good for that, but not on our X5s.
I just installed the DWS 06s (again) on my winter 20" setup for my 08 4.8 also, got 27k out of the last set.
Had the previous generation also and these are even better, they really are a GREAT tire!
Not much can be done on the inside edges due to the negative camber (it's a good thing, you want to have it).
We also can't switch the DWS 06s side for side, since they are directional, but if they are wearing in the middle (cupping) the tire pressure may actually be too high for the specific tires/wheels.
You might want to look at lowering your tire pressure a bit too... You don't have to run what BMW states on the door sticker
I personally like to run 28PSI front and 30PSI rear.
Tire pressure can make a HUGE difference in the wear of the tires, comfort in the ride and the handling...
Try the lower pressures (be sure to reset your TPMS) and see what you think.