Kimi Raikkonen ensured Ferrari ended the first pre-season test of 2015 on top by going fastest on the fourth and final day at Jerez.
The Scuderia's new SF15-T had already topped the first and second days in the hands of Sebastian Vettel, and Raikkonen carried on that momentum by setting the best time of the test on Wednesday, dipping down to 1m 20.841s to finish comfortably clear of the chasing pack.
Behind him, Marcus Ericsson continued Sauber's encouraging start to the new season by finishing second fastest, after new team mate Felipe Nasr had put the team top of the timesheets on day three.
The Swede also broke into triple figures in the lap charts, although Mercedes once again led the way in terms of total mileage as Lewis Hamilton clocked up 114 laps en route to setting the third fastest time of the day.
Max Verstappen worked his way up to fourth for Toro Rosso, as the team continued to clock up far more mileage than parent team Red Bull, with Daniil Kvyat restricted to 62 laps of running in the new RB11.
That was still more than Jenson Button managed at McLaren, who was disrupted by engine problems in the morning and then a fuel pump fault in the afternoon. However, in between issues the Englishman managed to help the Woking team to their most productive day of the test, completing 35 laps and setting a best time of 1m 27.660s.
That left Button eighth overall, behind Verstappen, Williams' Felipe Massa, Lotus's Romain Grosjean and Kvyat in the Red Bull.
Three red flags punctuated the day - Kvyat brought the first out after suffering a suspected ERS failure after just eight laps, while Hamilton spun at the chicane at midday and then Ericsson stopped out on track ten minutes from the chequered flag.
The teams now have two weeks before testing resumes at Barcelona on February 19-22. Force India are expected to join the fray, although their new car is not likely to appear until the third and final test, also at Barcelona, on February 26-March 1.
Unofficial Wednesday testing times from Jerez
1. Kimi Raikkonen, Ferrari, 1m 20.841s, 106 laps
2. Felipe Nasr, Sauber, 1m 22.019s, 112 laps
3. Lewis Hamilton, Mercedes, 1m 22.172s, 116 laps
4. Max Verstappen, Toro Rosso, 1m 22.553s, 97 laps
5. Felipe Massa, Williams, 1m 23.116s, 73 laps
6. Romain Grosjean, Lotus, 1m 23.802s, 53 laps
7. Daniil Kvyat, Red Bull, 1m 23.975s, 63 laps
8. Jenson Button, McLaren, 1m 27.660s, 35 laps
(source: f1.com)
