Which tire has the highest Treadwear (UTQG) in size 255/65R17

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 255/65R17?

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740 - Treadwear

 Cooper Discoverer SRX - UTQG: 740AB - Tire Rating: 0

 Continental CrossContact LX20 - UTQG: 740AB - Tire Rating: 0

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680 - Treadwear

 Continental TerrainContact A/T - UTQG: 680AA - Tire Rating: 0

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

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640 - Treadwear

 Kumho Road Venture SAT KL61 - UTQG: 640AB - Tire Rating: 4.29

 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

 Kumho Road Venture AT KL78 - UTQG: 500AB - Tire Rating: 4.39

 Toyo Open Country A/T - UTQG: 500AB - Tire Rating: 4.52

 Yokohama Geolandar A/T-S G012 - UTQG: 500AB - Tire Rating: 4.52

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440 - Treadwear

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

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400 - Treadwear

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

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320 - Treadwear

 Marshal Matrac X3 KL17 - UTQG: 320AAA - Tire Rating: 4.54

 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

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