Which tire has the highest Treadwear (UTQG) in size 255/60R18

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 255/60R18?

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680 - Treadwear

 Continental ContiCrossContact LX - UTQG: 680AB - Tire Rating: 4.17

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640 - Treadwear

 Toyo Open Country H/T - UTQG: 640AB - Tire Rating: 4.69

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600 - Treadwear

 Kumho Road Venture APT KL51 - UTQG: 600AA - Tire Rating: 4.25

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500 - Treadwear

 Maxxis AT-771 Bravo - UTQG: 500AA - Tire Rating: 4.19

 Yokohama Geolandar H/T-S G051 - UTQG: 500AB - Tire Rating: 4.3

 Nitto Terra Grappler All-Terrain Light Truck Radial Tire - UTQG: 500AB - Tire Rating: 0

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480 - Treadwear

 Nankang SP-5 - UTQG: 480AA - Tire Rating: 4

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440 - Treadwear

 Goodyear Wrangler HP - UTQG: 440AA - Tire Rating: 3.77

 Michelin Latitude Tour HP - UTQG: 440AA - Tire Rating: 4.3

 Pirelli Scorpion ATR - UTQG: 440AB - Tire Rating: 4.04

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420 - Treadwear

 Toyo Proxes ST 2 - UTQG: 420AA - Tire Rating: 4.43

 Toyo Proxes ST - UTQG: 420AA - Tire Rating: 4.58

 Continental ContiCrossContact UHP - UTQG: 420AAA - Tire Rating: 4.68

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400 - Treadwear

 Pirelli Scorpion Zero - UTQG: 400AA - Tire Rating: 3.53

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

 Nexen Roadian 542 - UTQG: 400AAA - Tire Rating: 4.21

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360 - Treadwear

 Hankook Optimo K406 - UTQG: 360AA - Tire Rating: 4.35

 Falken Ziex ZE-912 - UTQG: 360AA - Tire Rating: 4.02

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340 - Treadwear

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

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320 - Treadwear

 Kumho Ecsta X3 KL17 - UTQG: 320AAA - Tire Rating: 4.63

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300 - Treadwear

 Bridgestone Dueler H/T D684 - UTQG: 300BB - Tire Rating: 3.98

 Bridgestone Dueler H/T D840 - UTQG: 300BB - Tire Rating: 3.78

 Bridgestone Dueler H/P Sport - UTQG: 300AA - Tire Rating: 4.09

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280 - Treadwear

 Continental ContiSportContact 5 - UTQG: 280AAA - Tire Rating: 0

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