Felipe Massa topped the timesheets on the final day of testing at Bahrain, edging out Toyota's Timo Glock.
After two days spent dealing with reliability gremlins, Monday's final day of testing went off without any glitches for Massa, who completed 91 laps with a best time of 1:31.189.
Glock, who focused on mechanical and aerodynamic set-up work after completing a successful grand prix simulation the previous day, posted the second best time, was second quickest just 0.020s off Massa's pace.
"It was a good day for us. We did a lot of work on set-up and tried several things so in the end it has been worthwhile; we can be happy with the results," the Toyota driver said.
"I would like to say thanks to the guys at the track and back at the factory because everyone is working so hard to make progress. Today we looked at set-up over a longer distance and made some improvements but we still have to work hard. It has been an important test here and it has gone well.
"It was a good possibility to test in higher temperatures and we looked at car balance in warmer conditions as well as cooling."
Kimi Raikkonen had to settle for third place on the timesheets, bringing to an end his run of P1s at the Sakhir circuit. The reigning F1 World Champion's 1:31.329 was, however, only 0.140s behind his team-mate's best for the day.
Jarno Trulli completed the timesheets in fourth place.
Times
01 F. Massa Ferrari 1:31.189 91 laps
02 T. Glock Toyota 1:31.209 71 laps
03 K. Räikkönen Ferrari 1:31.329 85 laps
04 J. Trulli Toyota 1:31.689 86 laps
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