Which tire has the highest Treadwear (UTQG) in size 265/50R20

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 265/50R20?

---

740 - Treadwear

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

---

680 - Treadwear

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

---

640 - Treadwear

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

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

---

600 - Treadwear

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

---

520 - Treadwear

 Pirelli Scorpion STR - UTQG: 520AB - Tire Rating: 3.57

---

500 - Treadwear

 Kumho Solus KL21 - UTQG: 500AA - Tire Rating: 4.52

---

480 - Treadwear

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

---

460 - Treadwear

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

---

420 - Treadwear

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

 Marshal Matrac STX KL12 - UTQG: 420AA - Tire Rating: 4.66

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

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

 Maxxis HP-600 - UTQG: 420AA - Tire Rating: 4.38

 Kumho Ecsta STX KL12 - UTQG: 420AA - Tire Rating: 4.5

 Federal Couragia S/U - UTQG: 420AA - Tire Rating: 4

 Hankook Ventus ST RH06 - UTQG: 420AA - Tire Rating: 4.75

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

---

400 - Treadwear

 Achilles Desert Hawk UHP - UTQG: 400AA - Tire Rating: 4.63

---

360 - Treadwear

 Maxxis MA-S2 Marauder II - UTQG: 360AA - Tire Rating: 4.08

---

320 - Treadwear

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

---

240 - Treadwear

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

---