Nico Rosberg proved that his day one tally at Jerez was no fluke as he put another 151 laps on the new AMG Mercedes W06 on Tuesday.

The German's total for two days now exceeds 300 laps and, with team-mate Lewis Hamilton having added 91 of his own on day two, Mercedes far and away leads the distance chart at the opening pre-season test.

Echoing Hamilton's claim that the world champion's were not chasing lap times in southern Spain, Rosberg confirmed that pounding endlessly around the Jerez de la Frontera circuit would pay bigger dividends in the search for back-to-back titles.

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"Our goal is to do mileage because, last year, our weakness was reliability," the German noted, "It cost us points last year, so focusing on having a really, really reliable car this year has been the goal to start off.

"It is important to see the problems now and have time [to fix them] before Melbourne because, [with] the problems we see in Barcelona, the time is going to be short to Melbourne and [they'll be] more difficult to solve them."

Rosberg did not have an entirely trouble-free day, bringing out the red flag midway through the session as the Mercedes' engine cut due to a fuel issue and also revealing that there had been problems with the telemetry.

He admitted that it had been good to uncover some of the W06's weaknesses this early on, particularly as the Three Pointed Star expected the rest of the field to close down its advantage from last season.

"We've come a long way as a team, and we're a strong team, but of course we're keeping an eye on the opposition," he said, "Ferrari especially has been an eye-opener for us in the last couple of days, but still we're confident both that we can start the season well and also in terms of development."