Which tire has the highest Treadwear (UTQG) in size 275/60R20

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 275/60R20?

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740 - Treadwear

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

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680 - Treadwear

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

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640 - Treadwear

 Nitto NT421Q Premier All-Season Crossover - UTQG: 640AA - Tire Rating: 0

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600 - Treadwear

 Nitto Terra Grappler G2 All-Terrain Light Truck Radial Tire - UTQG: 600AB - Tire Rating: 0

 Cooper Discoverer LSX Plus - UTQG: 600AB - Tire Rating: 0

 Nitto Dura Grappler Highway Terrain Light Truck Tire - UTQG: 600AB - Tire Rating: 0

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580 - Treadwear

 Goodyear Wrangler TrailRunner AT - UTQG: 580AB - Tire Rating: 0

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520 - Treadwear

 Cooper Zeon LTZ - UTQG: 520AB - Tire Rating: 0

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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

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