– Sebastian Vettel is unsure if Red Bull will be able to recover sufficiently to challenge Mercedes in 2015.The Milton Keynes-based outfit has struggled for performance and reliability so far this season, with power unit supplier Renault encountering a host of problems in the early stages of Formula 1's new turbocharged V6 era.When asked if he feels his team can bounce back and draw level with the Silver Arrows next year, Vettel responded: "It's difficult to say, right now the gap is very big and we didn't really close it since the first race."We have tried lots of things to improve but they do the same thing. We need bigger steps of development to close the gap even more....
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