Mercedes AMG Petronas Championship leader Nico Rosberg says he is not yet feeling comfortable in the Mercedes W05 Hybrid at this weekend's Spanish Grand Prix. Rosberg missed most of the first practice session following an ERS cooling issue but returned to the circuit for the second session, where he set the second quickest time behind Mercedes team-mate Lewis Hamilton. "The team have done a great job during the short break that we have had since China," he said." We have brought some new upgrade parts here to Barcelona this weekend and they are working quite well on the car. It looks like we are very quick again, however personally I didn't feel very comfortable in the car...
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