Sebastian Vettel says Ferrari will begin working on bringing the SF15-T up to speed having after a welcome trouble-free day that yielded a 143 laps.

Following an eye-catching performance in the first two F1 pre-season tests, Ferrari endured a tougher start to the final test at the Circuit de Catalunya as Kimi Raikkonen suffered with a series of niggling issues on day one.

However, Vettel would complete a full programme in the car on day two, notching up 143 laps with a best time of 1min 25.339secs on the soft tyres, placing him fourth on the final timesheets.

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Though that would leave him 2.5secs adrift of Nico Rosberg's best lap on the same tyre, Vettel played down the deficit, insisting Ferrari has been focusing primarily on reliability up to this point and will only now begin to look at the pace.

"I think it was very positive that we did a lot of laps today because when we arrive in Melbourne we want to make sure we finish the race, that is priority number one. Then obviously you want to be as quick as you can, that is what we are working on now.

"We are trying to improve the car bit by bit with each test which isn't so easy with changing conditions. But the day was OK - the conditions were fairly constant, wind conditions in particular. Also the track was useable with a good temperature and we got good day, but it is still difficult to say where we are in comparison with other people."

Reflecting on the speed of the Mercedes, Vettel admits he is unsurprised the manufacturer is once again setting the pace.

"I'm sure the Mercedes time was very, very competitive and is definitely a benchmark, but we already knew they were those were the one to beat. I was pretty happy with the soft tyres, nowhere near, in terms of lap times compared to what Nico did but we are set up a little differently."