( CNN ) -- Lotus ' Kimi Raikkonen clocked the fastest time on the final day of Formula One Testing at Jerez Friday . The 2007 world champion came home in a time of one minute 18.148sec off 83 laps with Force India 's test driver Jules Bianchi in second spot on 1:18.175 . Ferrari 's Felipe Massa 's time of one minute 17.879 seconds , which was set on Thursday , remained the fastest time of the whole week . But Raikkonen , who finished third in the title race last season , is encouraged by the progress made over the past four days . Webber vows to battle Vettel for F1 title . `` We continued our work from Thursday and made some good progress , '' he told reporters ahead of the next test session in Barcelona on February 19 . `` We 're at the top of the timing monitors , but that means nothing in testing . Our focus has been testing parts on the car , but I 've been able to get the set-up more to my liking . `` For sure there 's more work to be done in this area , but that 's what we 're here for . The car feels strong and we seem to have a good idea of where we 're going with improvements . Let 's see what happens in Barcelona . '' Vettel revs up for glory . Meanwhile , triple world champion Sebastian Vettel was satisfied with his day 's work , despite being delayed by a pot-hole in the track . `` Everyone is on the limit here , running wide , using the maximum amount of track and the kerbs and unfortunately it started to break up , '' he told reporters . `` But the circuit did a very good job over lunch to get everything sorted and gave us an extra half hour at the end , so no real problem . '' Vettel completed 96 laps following the 30 minute wait and the German driver was left impressed with the car 's reliability . `` I think for the whole team it 's been quite a good test , '' said the German . `` No problems in terms of reliability and we did a lot of laps , so I 'm quite pleased with the results . `` I feel a bit better than last year . I think we had some issues with reliability then , so it seems we have done our homework well . ''
Ville Raikkonen the fastest lap on the track on final day of testing . Ferrari 's Felipe Massa clocked the best lap of the week . Sebastian Vettel led 96 laps after black - hole ##d .