Carlos Sainz pronounced himself happy with his mileage after two days of F1 testing in Jerez, the rookie notching up more laps than any other driver on day three after Nico Rosberg.

The Spaniard - one of three rookies to making their F1 debut in 2015 - managed 136 mostly drama-free laps in the Toro Rosso over the course of the day, setting the sixth fastest time.

The performance will come as a relief to engine supplier Renault, which has seen its mileage hampered on the Red Bull Racing side after Daniil Kvyat's front-wing issue on day two and technical woes for Daniel Ricciardo over the course of day three.

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For Sainz personally, the lap count is a big boost for himself and for the STR team, though he is sure his effort will also be evaluated by Red Bull and Renault as it attempts to claw back ground on its Mercedes and Ferrari rivals.

"The most positive thing that could happen was to finish second in terms of number of laps. What we are aiming for in this first test was the most laps possible and to do that many is a great encouragement for the team, you could see everyone with a smile on their face.

"[For me] I think it is as important as it is for the team, if not more important. I am leaving Jerez with more than 800kms and it is really important for me to start feeling at home in an F1 car and in the Toro Rosso so I can fine tune it to my liking.

"We are working more together than ever with Red Bull, so they will look at our mileage positively and we will learn from their reliability issues. It shows the good job STR at doing at this stage."