Barcelona, Day Four: Mercedes' Nico Rosberg signs off from testing in style

Formula 1's winter testing programme came to a close at Barcelona on Sunday and Nico Rosberg used the ever-critical final day to provide further evidence of the pace possessed by Mercedes on the eve of the 2013 season.

"Testing was good for us a whole but we would have loved to have had more consistency - especially from a tyres' point of view," he added. "I think every team had this kind of problem and it made it difficult to read the changes we made." One notable change Red Bull did make during the afternoon was to revert to an older specification wing on the RB9, having rolled out a new version on Saturday. Rivals McLaren, meanwhile, ended what was a similarly inconclusive winter from them with Button's time of 1:21.444 on the softs his and the team's best time of the test, but a long way off the Mercedes. In the afternoon Button switched to long stints on first the hard, and then medium, Pirellis and finished the final day with 122 laps on the board. While Raikkonen was fit enough to return to the Lotus E21 for the final day of action, Lotus completed less than half the total mileage of the majority of other teams after yet another gearbox problem cost them nearly all the morning's running. But, as has been the story of their winter, when the car was on the track it was quick and consistent with Raikkonen's fifth-fastest lap coming late on amid a run on soft tyres. Meanwhile, Williams assessed further aero revisions on their FW35 with first Pastor Maldonado, and then Valtteri Bottas, at the wheel with Caterham finally finishing ahead of Marussia on the timesheet once again. Day Four timesheet
1. Nico Rosberg, Mercedes, 1:20.130, 131 laps, Soft tyres.
2. Fernando Alonso, Ferrari, 1:20.494, 120 laps, Soft tyres.
3. Jenson Button, McLaren, 1:21.444, 122 laps, Unmarked tyres.
4. Nico Hulkenberg, Sauber, 1:21.541, 118 laps, Soft tyres.
5. Kimi Raikkonen, Lotus, 1:21.658, 50 laps, Soft tyres.
6. Paul di Resta, Force India, 1:21.664, 112 laps, Tyres unknown.
7. Pastor Maldonado, Williams, 1:22.415, 42 laps, Tyres unknown.
8. Sebastian Vettel, Red Bull, 1:22.514, 100 laps, Unmarked tyres.
9. Valtteri Bottas, Williams, 1:22.524, 31 laps, Soft tyres.
10. Charles Pic, Caterham, 1:23.115, 116 laps, Tyres unknown.
11. Jules Bianchi, Marussia, 1:23.167, 62 laps, Tyres unknown.
12. Daniel Ricciardo, Toro Rosso, 1:23.628, 91 laps, Tyres unknown.
13. Max Chilton, Marussia, 1:24.103, 49 laps, Tyres unknown.