What's behind Vettel's winning streak?

Sebastian Vettel celebrates his sixth victory of the 2013 season to extend his lead in the title race to 53 points over Fernando Alonso.
Sebastian Vettel celebrates his sixth victory of the 2013 season to extend his lead in the title race to 53 points over Fernando Alonso.

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    What's behind Vettel's winning streak?

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Former Red Bull F1 driver David Coulthard explores the story behind Sebastian Vettel's dominance. Amanda Davies reports.