Nico Rosberg says topping the overall timesheets at the end of F1 pre-season testing gives him 'a little bit extra' as he heads to the 2015 opener in Australia as the driver to beat alongside Mercedes team-mate Lewis Hamilton.

The German showcased his pace on Friday with a soft tyre run that yielded a 1min 22.7secs lap, a time that wouldn't be surpassed as no other driver got below the 1min 23secs mark over the four days.

Indeed, though Rosberg played down the significance of topping the timesheets, despite never once trialling the super-soft tyres like his closest rivals from Williams and Ferrari, he admits that going fastest of all does give him a boost.

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"I am happy to be quickest," he said. "Of course it is not worth much in winter testing, but it does give you that little bit extra, which is always useful.

"I'm pleased with the winter because I think we have done a good job with the development of the car. The others are also quick, but I am optimistic because we have a good car. We've been comfortable and we've been quick through the days, setting the best time of the test. Things are going in the right direction."

The final of testing was an otherwise low key affair for Mercedes and Rosberg, completing 146 laps and only setting the seventh quickest time as the team focused on set-up work on constant fuel loads.

However, with warm temperatures and constant conditions, Rosberg believes it was a very useful day to trial what he describes as a 'problematic' soft tyre.

"Today was an amazing day for testing because the conditions were so constant out there, the first time this winter. We kept the fuel load the same all the time and did some set-up work.

"We did a soft, long run at the end because in Melbourne we will have the soft tyre, which will be problematic because it really comes apart quite quickly, but I think we managed really