I replaced all four of my OE Continentals on the 4/4 Sport at 17,000 miles as I believe it's the cheapest form of safety if you are a reasonably enthusiastic driver.
£160 for 4 Toyos all inc.
The inside edge on the fronts wear was my decider - camber set up helps it handle better when pressed. They are very skinny tyres so the small footprint needs to be effective.
