Jean-Eric Vergne believes it was a success for Toro Rosso to get any track time at all on the opening day of the first test at Jerez.

The first day saw Kimi Raikkonen rack up the most laps for Ferrari with 31, while McLaren didn't even run and Red Bull managed just three laps. Vergne, however, completed 15 laps and set the fifth fastest time, although also caused a red flag when he stopped at Turn 4 in the afternoon.

Asked by if he had expected such a challenging day, Vergne said the team had been well aware it could struggle for mileage.

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"Obviously we had a really ambitions program but on the other hand we knew it would be extremely difficult to run today when we saw that some teams didn't even put their car on track," Vergne said. "Of course it's frustrating because you always want to run more and you want to do the program that you had planned but you have to step back a little bit and see what is happening in the paddock and today was actually quite good to achieve what we have done."

With his running being limited by issues with the engine mapping, Vergne said it was actually encouraging to be gathering experience by dealing with problems rather than enjoying smooth running.

"I think it's been a good day to at least be able to run and get some problems because the more you drive the more you see problems and that's how it is with this new car. So we are right there knowing we would have some bad times and some difficult moments to try and get over some problems and that's what happened, but still I think it's a good achievement to have driven for 15 laps today.

"It shows the team has worked a lot this winter to get the car ready and I think it's quite a good achievement. Now we need to get the engine right -the new power unit in the correct way - and then we will be able to have some decent running to get a first feel of the car I think."