A Mercedes topped the times sheets for the fourth time on the twelfth and final day of pre-season testing.
Nico Rosberg improved on the lap time set by team mate Lewis Hamiolton yesterday, lapping the Circuit de Catalunya in 1'20.130.
Rosberg set the early pace during the morning session but was briefly displaced at the top of the times by Fernando Alonso.
The Ferrari driver recorded a 1'20.606 but Rosberg responded almost immediately with his best effort of the day. Like Alonso, he set the time on soft tyres.
Jules Bianchi had a busy morning for Marussia, covering 62 laps including live pit stops and start practice.
Other teams were concentrating on upgrades. Ferrari ran their new exhaust for the first time and Williams continued development on their rear aerodynamic package introduced yesterday.
It was another frustrating day for Lotus. Kimi Raikkonen returned to the car after being unwell yesterday but managed just one lap before his gearbox broke.
The team had to replace the unit and he only returned to the track shortly before the lunch break.
In the afternoon most teams prioritised long runs. With no red flags interrupting the test seven drivers managed at least 100 laps each, and the Marussia pair covered that many between them, Max Chilton taking over from Jules Bianchi.
Williams also split their day's work between their two drivers, Valtteri Bottas driving the car in the afternoon.
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