Mercedes AMG Petronas Championship leader Nico Rosberg says that Red Bull remains the benchmark in 2014, despite the reigning champions sitting 97 points behind Mercedes after the opening four races of the year. Rosberg, who claimed victory in Australia, reckons Mercedes still needs to improve as a team if they are to maintain their current advantage. "Very recently Red Bull was still the benchmark and is still the benchmark as a team - I don't think it changes that quickly - so we need to be careful and keep on improving ourselves, which we are doing, to keep our advantage or even extend it," Rosberg is quoted by Sky Sports. "The target needs to be to extend it, that's...
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