Which tire has the highest Treadwear (UTQG) in size 225/60R15

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 225/60R15?

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680 - Treadwear

 Kumho Solus KR21 - UTQG: 680AB - Tire Rating: 4.5

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620 - Treadwear

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

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440 - Treadwear

 Cooper Cobra Radial G/T - UTQG: 440AB - Tire Rating: 4.43

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400 - Treadwear

 Marshal Matrac MH11 - UTQG: 400AA - Tire Rating: 4.43

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

 Hankook Optimo K415 - UTQG: 400AA - Tire Rating: 4.61

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340 - Treadwear

 Nexen N2000 - UTQG: 340AAA - Tire Rating: 4.42

 Kumho Solus KH15 - UTQG: 340AAA - Tire Rating: 4.18

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300 - Treadwear

 Hankook Optimo K424 MEO2 - UTQG: 300AA - Tire Rating: 3.76

 Yokohama C.DRIVE - UTQG: 300AA - Tire Rating: 4.38

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280 - Treadwear

 Continental ContiPremiumContact 2 - UTQG: 280AAA - Tire Rating: 4.46

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260 - Treadwear

 Pirelli P7 - UTQG: 260AAA - Tire Rating: 3.81

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180 - Treadwear

 Pirelli P6000 - UTQG: 180AA - Tire Rating: 3.76

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