Grosjean knows he must raise his game

Romain Grosjean has accepted that he has to shoulder the full responsibility for making sure he does a better job in wheel-to-wheel combat next year. After Lotus proved its faith in the Frenchman by handing him a fresh contract for 2013 , Grosjean says that a big focus for his winter preparations is on overcoming the kind of troubles that marred his 2012 campaign .

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