Lewis Hamilton says Mercedes is focusing its efforts on bringing the W06 up to a reliable standard after team identified it as a particular area of improvement for the 2015 season.

Though the Mercedes W05 was the dominant force throughout 2014 in the hands of Hamilton and Nico Rosberg, it still suffered its share of technical issues over the course of the year, at one stage threatening to influence the title fight between the two drivers.

Indeed, the defending champion says Mercedes measured the W05's reliability as 'in the 80s' in terms of percentage last year, adding that it is focusing its efforts on ensuring it stays over 90 per cent with the W06 in 2015.

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"We have done some great mileage and there has been a lot of attention to that process to try and improve on that area," he said. "They [Mercedes] always manage it by percentage, but I think we were in the 80s last year and this year we want to be in the 90s. Time will tell, but I think it is better - we have some things we are trying to work on."

Mercedes caught the eye during the first F1 test in Jerez by completing 515 laps over four days - the equivalent of seven race distance - and proceeded to add a further 446 without major issue in Barcelona, despite Rosberg suffering neck pain and Hamilton picking up a fever.

Even so, though Mercedes has now covered considerably more miles than any other team over the eight days, Hamilton admits it could always use more time on track.

"Testing every year feels shorter and shorter and there is always more than you could have done."