Which tire has the highest Treadwear (UTQG) in size 255/50R20

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 255/50R20?


480 - Treadwear

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


460 - Treadwear

 Nexen Roadian HP - UTQG: 460AA - Tire Rating: 4.13


420 - Treadwear

 Yokohama Parada Spec-X - UTQG: 420AA - Tire Rating: 4.55

 Nitto NT420S All-Season Tire - UTQG: 420AA - Tire Rating: 0

 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


400 - Treadwear

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

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


320 - Treadwear

 Yokohama Advan ST - UTQG: 320AAA - Tire Rating: 4.55


240 - Treadwear

 Accelera IOTA - UTQG: 240AAA - Tire Rating: 4.25