NBC Sports
updated 7/26/2013 1:47:08 PM ET 2013-07-26T17:47:08

Sebastian Vettel may have comfortably finished quickest in both Friday practice sessions ahead of the Hungarian Grand Prix this weekend but the three-time world champion still believes that there is room for improvement. Vettel headed up a Red Bull 1-2 in both sessions as Mark Webber proved to be his closest challenger, but he is…

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