Sebastian Vettel says he has developed a 'positive feeling' with the Ferrari after spending the final day of pre-season F1 testing focusing primarily on reliability.

The German completed a relatively meagre 74 laps compared with his rivals and was placed in the latter half of the timesheets as he and the team focused on bringing the SF-15T up to standard in terms of durability.

Though teething issues crept in to limit running at time, Vettel was otherwise pleased with the progress and the pace of his car with just four more days of pre-season testing to go.

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"I can say that we have focused mainly on the car's reliability, completing some long-runs, and testing various settings and tyre configurations. We could not run as much as we'd like, but at this stage of winter testing there are always some teething problems you have to deal with.

"Overall, I can confirm that my feeling with the car is positive and now I'm looking forward to the next week of testing."

Vettel also took time to wish his predecessor at Ferrari, Fernando Alonso, a speedy recovery after a crash that left him concussed. The four-time champion was behind Alonso when the accident occurred.

"First of all, I'd like to wish Fernando a quick recovery. Luckily, we have already received some good news, so I hope he we'll be back in top form at next week's test."