Singapore GP: Mercedes unsure how much upgrades have helped car after practice
|By Edd Straw and Simon Strang||Friday, September 21st 2012, 16:31 GMT|
It is too early to see what impact Mercedes new upgrades will have on the W03 over the Singapore Grand Prix weekend, according to the team's drivers Nico Rosberg and Michael Schumacher after Friday's free practice sessions
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