Which tire has the highest Treadwear (UTQG) in size 235/50R17

It's time to buy new tires for my car, but I want to buy a tire that lasts longer than the original brand, OEM. Which tire has the highest Treadwear in this size 235/50R17?

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700 - Treadwear

 Continental PureContact - UTQG: 700AA - Tire Rating: 0

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620 - Treadwear

 Cooper CS5 Ultra Touring - UTQG: 620AA - Tire Rating: 0

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540 - Treadwear

 Continental ExtremeContact DWS - UTQG: 540AA - Tire Rating: 0

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500 - Treadwear

 Nexen CP672 - UTQG: 500AA - Tire Rating: 4.57

 Cooper Zeon RS3-A - UTQG: 500AAA - Tire Rating: 0

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480 - Treadwear

 Michelin Energy Saver A/S - UTQG: 480AB - Tire Rating: 0

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460 - Treadwear

 Dunlop Direzza DZ102 - UTQG: 460AA - Tire Rating: 0

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400 - Treadwear

 Sunitrac Focus 9000 - UTQG: 400AA - Tire Rating: 4.32

 Toyo Proxes TPT - UTQG: 400AA - Tire Rating: 4.52

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340 - Treadwear

 Continental ContiExtremeContact DW - UTQG: 340AAA - Tire Rating: 4.58

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320 - Treadwear

 Michelin Primacy 3 - UTQG: 320AA - Tire Rating: 4.67

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300 - Treadwear

 Toyo Proxes 4 - UTQG: 300AAA - Tire Rating: 4.26

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280 - Treadwear

 Kumho Ecsta LE Sport KU39 - UTQG: 280AAA - Tire Rating: 4.38

 Continental ContiSportContact 3 - UTQG: 280AAA - Tire Rating: 4.68

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180 - Treadwear

 Yokohama Advan Sport - UTQG: 180AAA - Tire Rating: 4.23

 Yokohama Advan Sport V103 - UTQG: 180AAA - Tire Rating: 4.38

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