Which tire has the highest Treadwear (UTQG) in size 235/45R18

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 235/45R18?

700 - Treadwear

 Continental PureContact - UTQG: 700AA - Tire Rating: 0

620 - Treadwear

 Cooper CS5 Ultra Touring - UTQG: 620AA - 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

 Continental SureContact RX - UTQG: 560AAA - Tire Rating: 0

 Continental ExtremeContact DWS 06 - UTQG: 560AAA - Tire Rating: 0

540 - Treadwear

 Continental ControlContactSport A/S - UTQG: 540AA - Tire Rating: 0

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

500 - Treadwear

 Kumho Solus TA31 - UTQG: 500AA - Tire Rating: 0

 Continental ProContact GX - UTQG: 500AA - Tire Rating: 0

 Continental ProContact TX - UTQG: 500AA - Tire Rating: 0

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

480 - Treadwear

 Michelin Energy Saver A/S - UTQG: 480AB - Tire Rating: 0

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

440 - Treadwear

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

400 - Treadwear

 Goodyear Eagle LS-2 - UTQG: 400AA - Tire Rating: 3.75

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

 Pirelli Pzero Nero - UTQG: 400AAA - Tire Rating: 4.31

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

320 - Treadwear

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

 Michelin Primacy 3 - UTQG: 320AA - Tire Rating: 4.67

300 - Treadwear

 Toyo Proxes 4 - UTQG: 300AAA - Tire Rating: 4.26

 Hankook Ventus Prime 2 K115 - UTQG: 300AA - Tire Rating: 2.84

280 - Treadwear

 Continental ContiSportContact 3 - UTQG: 280AAA - Tire Rating: 4.68

 Kumho Ecsta LE Sport KU39 - UTQG: 280AAA - Tire Rating: 4.38

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

240 - Treadwear

 Toyo Proxes Sport - UTQG: 240AAA - Tire Rating: 0

 Michelin Primacy HP - UTQG: 240AA - Tire Rating: 4.17