Which tire has the highest Treadwear (UTQG) in size 255/75R15

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 255/75R15?

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600 - Treadwear

 Goodyear Fortera - UTQG: 600AB - Tire Rating: 4.23

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500 - Treadwear

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

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480 - Treadwear

 Firestone Destination A/T - UTQG: 480AB - Tire Rating: 4.27

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440 - Treadwear

 Hankook DynaPro AS RH03 - UTQG: 440AB - Tire Rating: 4.72

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

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420 - Treadwear

 Goodyear Fortera Confortred - UTQG: 420 - Tire Rating: 0

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400 - Treadwear

 Bridgestone Dueler A/T - UTQG: 400AB - Tire Rating: 3.93

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