Jenson Button has shrugged off the assertion that McLaren-Honda will struggle to reach the finish of the Australian Grand Prix despite its poor reliability throughout pre-season testing.

The aggressively-designed, Honda powered MP4-30 has endured a fraught build up to the 2015 F1 curtain raiser with persistent technical problems limiting it to an average of just 32 laps per day during 12 days of winter testing.

As such, McLaren comes to Melbourne under few illusions about the gravity of its challenge this weekend, though Button paints a more optimistic picture, claiming he can reach the end of the race even though the car is yet to tackle a race simulation.

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"I have no aim in terms of position," he said. "I do believe we will finish. You are going to have doubts, it would be stupid not to have doubts when you look at winter testing because we haven't simulated a race distance yet, but our aim is to finish and I have confidence that we can get enough mileage under our belt this weekend to figure out niggling problems if we have them.

"The most important thing is to get out there and see what we have. We haven't had a lot of testing so we haven't done a lot of development work or basic set-up, so key for us is to understand the car a bit more and seeing progress.

Indeed, though Button admits the car hasn't been run at 100 per cent, he says the steps forward made by the likes of Red Bull between winter testing and the opening round last year show it can be done.

"When you looked at last year's winter testing, you could say that probably half of the field wouldn't finish the first race. Only two cars retired with engine issues, so it is amazing how it comes to the first race and people find reliability in different ways.

"It doesn't mean that we will, but the amount of hours that the team has been working and the way Honda has been working flat out has been great."