Nico Rosberg and his Mercedes team are diligently putting in unprecedented mileage onto their new car during testing a Jerez, but the German has cast a wary eye towards Ferrari who appear to have found a big step in performance.
Speaking after his second day at the wheel of the W06 Hybrid, Rosberg said, "Performance wise I don't know where we are but the Ferrari times look very encouraging for them, so it will be an interesting year for Formula 1."
Mercedes' Achilles heel, if they had one, last year was reliability. This year the focus has been on tightening up in that area.
Despite coming to a halt out on track with a technical issue just before lunch on Tuesday, Rosberg was upbeat about progress made, "Reliability was our main issue over the last year, so our goal for 2015 is to sort this out. That is why I can be happy with my first pre-season test as I did a lot of mileage on both days."
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