An optimistic Jenson Button believes McLaren are on course to be fully prepared for the first grand prix of the season in Australia - but admits they currently can't match Mercedes' levels of rear downforce.Although the form of the Woking-based squad so far in pre-season testing hasn't attracted quite the same amount of attention as the works Mercedes-powered outfit, the MP4-29 has once more shown both promising pace and reliability levels at the first Bahrain test. With Kevin Magnussen having already set the overall pace on Day Two, albeit on supersoft tyres, Button's first appearance of the week on Friday saw the 2009 World Champion top a century of laps and finish second to only...
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