McLaren's world champion Lewis Hamilton showed some aggressive driving to post top-three lap times in both sessions.
Lap times on the 2013 tires are expected to increase by around half a second a lap.
In my opinion, lap times didn't matter all through the winter tests.
Many of the teams have been testing the slicks in Barcelona ahead of their reintroduction, with lap times falling as a result.
The 22-year-old Sablikova maintained an incredibly steady pace, keeping her lap times under 32 seconds until her final trip around the Richmond Olympic Oval.
Lap times are not necessarily directly comparable because of differing conditions.
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At the Barcelona circuit, which hosts the Spanish Grand Prix, many cars set lap times in testing this month that were quicker than pole position for the 2012 race.
Along with the changes to aerodynamics and engines, this was introduced to stop the alarming escalation in cornering speeds and lap times that has accompanied the tyre war between Bridgestone and Michelin.
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All 22 cars run for the first 15 minutes, at the end of which the slowest six will be eliminated and fill the final six places on the grid in order of their lap times.
The Spaniard traded fastest lap times with team-mate Sebastien Buemi in a quiet opening half hour and improved his lap time by over six seconds, but he still finished the session in 20th position, one place behind his team-mate.
Then there was the North Yorkshire community school which had turned the Pi into an RFID (radio-frequency identification) reader to measure lap times in their cross-country races, and the London independent school whose pupils had come up with Teacher's Pet, a way of delivering homework via USB sticks plugged into the tiny computer.
One insider at a top team told BBC Sport that while it was hard to be definitive about comparative pace because of the differences to lap times created by fuel loads and tyres, Ferrari appeared to have a slight advantage over Red Bull at the moment as the team with the fastest car.
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"We weighed up all the options, and went into a lot of detail, looking at lap-times in the races, in qualifying and many other factors, " Faure said.
The rule changes introduce a number of novelties that have never been used in F1 before - notably a front wing that a driver can adjust a limited number of times a lap in an attempt to make overtaking easier.
Double world champion Alonso looked set to top the times with an impressive lap set in the morning but the German beat him by 0.023 seconds later on.
Fifteen-times TT winner and outright lap record holder McGuinness says his fitness is better than ever and he is mentally prepared for the challenge.
She said that driving a qualifying lap at Daytona, where drivers shift gears three times then run the engine pretty much wide open, was 90% crew preparation and 10% driver.
She said that driving a qualifying lap at Daytona -- where drivers shift gears three times then run the engine pretty much wide open -- was 90% crew preparation and 10% driver.
She said that driving a qualifying lap at Daytona -- where drivers shift gears three times then run the engine in its highest gear -- was 90% crew preparation and 10% driver.
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Unlike Hulkenberg, who set his fastest lap on one short run, Alonso's was set during a number of formidable-looking runs, in which he produced a set of consistently quick times around the same pace as his fastest lap time.
The end result was that nobody knew who was on pole and the top 10 drivers got out of their cars and were swapping times to work out who had actually set the hot lap.
Pasini went into the final lap in the lead but was passed by the first corner, with the lead changing hands numerous times before Pasini emerged victorious.
Danica Patrick, the first woman to win the pole position at the Daytona 500, led three times, including five laps under green -- also becoming the first woman to lead a lap at the race not under a yellow flag caution.
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