Sebastian Vettel says questioning his credentials as a quadruple Formula 1 world champion is disrespectful and, that no matter how good a driver is, that without a capable car winning is impossible. After four consecutive titles successes, culminating in the ultra-dominant second half of the 2013 season, the German has struggled even to match Red Bull newcomer Daniel Ricciardo this year with a less competitive and unreliable car. Monaco, for example, was a particularly fraught weekend for Vettel, who was rarely confident his RB10 would even keep running. 'I have had many problems with the car,' he said in an interview published by RTL. 'So it's hard to get in your rhythm and get the best...
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