Reigning world champion Jenson Button brought the Jerez test to a pleasing conclusion for McLaren today, posting the fastest overall time of the two week test.

The most consistent weather conditions of the entire test allowed Button and his team to work through a tyre compound evaluation programme, balancing aero and mechanical set-ups to the different types of tyre.

In the morning, the Englishman completed a number of shorter runs on three separate tyre compounds, evaluating set-ups before switching to longer runs in the afternoon, with a view to evaluating the tyres' durability. Following his third test with the Woking team, Button said that he feels very comfortable and confident in the car.

McLaren now heads to Barcelona for the fourth and final test of the winter. Both drivers will spend alternate days in the car evaluating the new bodywork and aerodynamic components ahead of the season-opener in Bahrain.

After evaluation of fuel loads in the morning, Renault's attention switched to long runs in the afternoon along with set-up work, Robert Kubica completing 117 laps on his way to posting the second quickest time of the day.

"It was a good day and we tried a lot of different things," said the Pole, "which has given us lots of useful information. To begin with we did some evaluation with different fuel loads to check the balance of the car and then in the afternoon we did long runs with heavy fuel to simulate a race distance. We completed most of the programme and I was pretty happy with the car."

"Another solid day of work as we made the most of the good weather," added Alan Permane. "We ran the car with varying fuel loads this morning to see how it reacted and we were pleased with the results. Then we attempted a race simulation and, although it was interrupted, we still managed to cover the required number of laps. Later in the afternoon we concentrated on some set-up work and found a good direction with the car."

Sauber had an altogether better day than yesterday when a fuel system problem restricted him to just 28 laps. Today, the Japanese youngster completed 117 laps on his way to posting the third quickest time of the day.

"I'm really happy with our final day of testing," said Kobayashi. "It was a perfect day for us. The conditions were ideal and the car ran trouble-free, so we were able to complete 117 laps and gather a lot of data. We made some progress with the set-up of the car. We will now analyse the data and draw the relevant conclusions for the next test in Barcelona."

"After a difficult day yesterday, I'm really pleased with what we achieved today," added test engineer, Thomas Hunsicker. "We worked on the set-up of the car, tested different tyre compounds and did some aerodynamic evaluations. Thanks to the good conditions and the reliability of the car, we were able to complete our overall testing programme for Jerez."

Tonio Liuzzi brought Force India's second test to a close, the Italian covering 80 laps of the Spanish track with a programme that included work on set-up and understanding the car's behaviour with the heavier fuel loads.