Which tire has the highest Treadwear (UTQG) in size 225/50R18

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 225/50R18?

---

800 - Treadwear

 Continental TrueContact - UTQG: 800AB - Tire Rating: 0

---

780 - Treadwear

 Cooper CS5 Grand Touring - UTQG: 780AA - Tire Rating: 0

---

740 - Treadwear

 Goodyear Assurance ComforTred Touring - UTQG: 740AB - Tire Rating: 0

---

600 - Treadwear

 BFGoodrich Advantage T/A Sport - UTQG: 600AA - Tire Rating: 0

---

560 - Treadwear

 Nitto Motivo All-Season Ultra High Performance Tire - UTQG: 560AA - Tire Rating: 0

---

540 - Treadwear

 Continental ExtremeContact DWS - UTQG: 540AA - Tire Rating: 0

---

500 - Treadwear

 Cooper Zeon RS3-A - UTQG: 500AAA - Tire Rating: 0

 Nexen CP672 - UTQG: 500AA - Tire Rating: 4.57

---

480 - Treadwear

 Bridgestone Ecopia EP422 - UTQG: 480AA - Tire Rating: 0

---

440 - Treadwear

 Aeolus AU02 - UTQG: 440AAA - Tire Rating: 4.75

 Cooper CS3 Touring - UTQG: 440AA - Tire Rating: 0

---

420 - Treadwear

 Kumho Ecsta 4X KU22 - UTQG: 420AAA - Tire Rating: 4.69

 Nexen N5000 - UTQG: 420AA - Tire Rating: 4.55

---

400 - Treadwear

 Continental ContiProContact - UTQG: 400AAA - Tire Rating: 4.23

---

320 - Treadwear

 Nankang AS-1 - UTQG: 320AA - Tire Rating: 4.46

---

300 - Treadwear

 Yokohama S.DRIVE - UTQG: 300AAA - Tire Rating: 4.33

---

280 - Treadwear

 Continental ContiSportContact 5 - UTQG: 280AAA - Tire Rating: 0

 Bridgestone Potenza RE050A - UTQG: 280AAA - Tire Rating: 3.84

---

260 - Treadwear

 Pirelli P7 - UTQG: 260AAA - Tire Rating: 3.81

---

180 - Treadwear

 Yokohama Advan Sport V103 - UTQG: 180AAA - Tire Rating: 4.38

---