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Although there has been a marked improvement this year, he is still finding it difficult to match the performances of Rosberg.
There have been suggestions that Schumacher could pack it in before his contract expires in 2012, but he is having none of it.
"I will fulfil my three-year contract with Mercedes after which I will work as a representative of the team's brand," he told Germany's Bunte.
He added: "I am on a mission to take Mercedes GP to the top step of the podium. Fighting for 10th place is not always pleasant. I expect to be in a better position soon."
Although he is confident of improving, Schumacher also admits that being 42-years-old "is not the same as 25".
Source: Planet-F1