For the second successive day, Toro Rosso's Sebastian Vettel has topped the timesheets at Jerez.

Once again, weather conditions were perfect, with the air temperature reaching 35 degrees C, and all ten teams continued the final test before the summer break.

Today marked Toro Rosso's first real test of the 2009 Bridgestone slick tyres, with Vettel running two types of slick throughout. The STR 3 was run with a smaller wing to replicate the predicted levels of downforce as demanded by next year's regulations. The day was trouble-free for the Faenza based outfit with Vettel simulating a long run test, as well as working on the balance of the car.

"I spent the whole time on the 2009 spec slick tyres and the biggest difference you notice is in the slow corners, where you feel more mechanical grip," said the German. "However, the low downforce configuration in line with next year's rules means you have a lack of aero which you feel on the high speed sections, but it is balanced out by more grip from the tyres. We tried two types of tyre and it was an interesting experiment, from which we got loads of data to study."

Second quickest was McLaren's Pedro de la Rosa who actually quickest for much of the day. The Spaniard's programme consisted of evaluation of the 2009-spec slick tyres and aero package in the morning, while reverting to 2008 tyres in the afternoon. Having completed 122 laps on his way to posting the second quickest time of the day, de la Rosa, who continues here tomorrow, was the busiest man at the Spanish track.

Having just experienced his "most difficult weekend of the year, Kimi Raikkonen was back in action for Ferrari as the Italian team concentrated on comparisons between various different set-up options on the F2008, in preparation for the forthcoming races. The Finn was the fastest non-slick runner, finishing 0.603s off Vettel's pace.

Fourth quickest was Nico Rosberg in the Williams, the German completing 112 laps.

Mark Webber began his two days of running, his RB4 fitted with slick tyres all day, with two types of Bridgestone tyre on offer. Today's programme therefore focussed mainly on 2009 development, with a smaller wing fitted to approximate to the reduced levels of downforce allowed in next year's regulations. Other elements of the 2009 package were also evaluated, but tomorrow, the Australian and the team return to short term development for the upcoming races of this season.

Alex Wurz continued his programme in the Honda, the main item on the agenda being the evaluation of the 2009 slick tyres. As with its rivals, the RA108 was therefore set up in a reduced downforce configuration based on the levels of downforce which will be run in the 2009. Running both the medium and hard compound tyres, Wurz completed 77 laps finishing sixth on the timesheets. Rubens Barrichello will join the team tomorrow.

Jarno Trulli returned to the cockpit of the TF108. After yesterday's work on 2009 tyres he switched focus back to this year's car, concentrating on preparations for next week's Hungarian Grand Prix. He spent the morning working on set-up for the Hungaroring, before switching to aerodynamic comparisons in the afternoon. Timo Glock will take over tomorrow, having received the all-clear to drive after his heavy accident in the German GP.

"After yesterday's preparations for 2009, today we went back to this year's work," said the Italian. "Our focus for the day was the Hungarian Grand Prix, looking at set-up this morning because the afternoons here are too windy and too hot for that. After lunch we worked on aerodynamic correlation between the circuit and the wind tunnel. We tested some of the aero package for Hungary and there is more to come later in the week. We made it through a lot of laps and made progress. Today wasn't about looking for lap times but about improving the car. We are in a close fight for 4th in the constructors' championship and that is what we want to achieve.