(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.
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Pastor Maldonado took the new Williams for a spin at Barcelona on February 19 following the launch at Circuit de Catalunya.
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Senna vs. Fangio: Who is the greatest?
Ayrton Senna and Alain Prost were long-time rivals before they became teammates at McLaren.
United in rivalry: Prost and Senna
"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."
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."
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The new Infiniti Red Bull Racing RB9 was launched at the Austrian-owned Formula One team's English headquarters in Milton Keynes on February 3.
Mark Webber, left, and triple world champion Sebastian Vettel pose with the Red Bull they will be driving this year.
Title rivals Ferrari launched the new F138 which they hope will power Fernando Alonso to glory in 2013.
British team McLaren unveiled its car on January 31. New driver Sergio Perez (right) poses with 2009 world champion Jenson Button and the new MP4-28.
Former McLaren star Lewis Hamilton, left, and new teammate Nico Rosberg pose with the new Mercedes W04 on February 4.
Sauber's new C32 was launched in Switzerland on February 2. It will be driven by Perez's replacement Esteban Gutierrez and Nico Hulkenberg, who left Force India in 2012.
Force India's Paul Di Resta with the new VJM06 which was launched on February 1 at Silverstone. His new teammate had yet to be named.
Charles Pic and Dutch rookie Giedo van der Garde launched Caterham's new CT03 car on the first day of preseason testing at Circuito de Jerez on February 5.
Romain Grosjean was third-fastest on the opening day in Jerez for Lotus, which was the first team to launch its new car -- the E21 -- on January 28.
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Prost and Senna (No.1) clash at the Japanese Grand Prix at Suzuka in 1989. Prost clinched the title after the Brazilian was controversially disqualified after winning the race.
As they both battled for world titles at McLaren, Prost and Senna's relationship came under great strain.
Stand off: Senna and Prost walk away after the early crash at Suzuka in the final race of the 1990 season which left the Brazilian as world champion.
Prost's time with McLaren proved the most fruitful of his career as he captured three world titles.
Prost earned the nickname 'The Professor' for his thoughtful and studied approach to Formula One racing.
Prost competing in wet conditions at the Monaco Grand Prix which he won four times during his glittering career.
Prost and Senna formed a united team in 1988 as the latter won the championship for McLaren.
The medical team at Imola tend to the stricken Senna after his fateful crash in the San Marino Grand Prix in 1994.
Prost joined a pantheon of Formula One greats at Senna's funeral in Sao Paulo in 1994.
In the latter part of career Prost had to battle with the youthful exuberance of future seven-time champion Michael Schumacher.
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