New tires for 535i -- long life & quiet?

[UG_Passat]

Currently have Continental ExtremeContact DWS06 on the car. They honestly perform well. Generally wear really well, currently have 22k on them and rear tires are showing 5/32" on the inside.

I dont really need all season tires since this car will never see snow.
Unfortunately when I look at all other tires that are NOT all season, the UTQG for treadwear all drops off a lot. I'd like to continue to get 20-30k out of the rear tires (fronts are still 7/32" so I assume I'll get about 40k out of the continentals). Is there a summer tire that still gets decent tread life?

Any suggestions?

the only tire I know of right now that has a decent UTQG mileage rating is the Kumho ECSTA PS31, which has a wear rating of 460. Whether it actually lasts 20-30k, you'll have to check out the TireRack user reviews. But, it's not going to be anywhere comparable to a Michelin PS4S.