Mercedes team principal Toto Wolff says Mercedes is still aware that reliability could stop Lewis Hamilton from taking his fifth world drivers championship despite him holding a 67 point advantage over title rival Sebastian Vettel with just four races remaining. Mercedes has enjoyed a huge upturn in form since the summer break, with Hamilton taking 168 out of a possible 175 points since Silverstone, form that has left his title rival Vettel licking his wounds and Ferrari looking foolish once more. Despite their charge towards a fifth straight constructors championship also, Wolff says he hasn't taken his eye off the ball and neither has the team, admitting that reliability could still play...
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