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Barcelona fourth pre-season test Test day four
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Forty minutes left and still no sign of Button coming out
A 1m23.4942 in the end for the German
Rosberg seemed to be on a lowish fuel run and pushing hard, but his tyres looked as if they were past their best
We apologise to the fans who believe we jinxed the possibility of a Mercedes 1-2 by mentioning it.
But as they say, it's just testing..
But as they say, it's just testing..
While Red Bull is waiting for Vettel to return to the pits
Rosberg is on his sixth lap of the day already
Maldonado has completed his first installation lap of the day in the Williams
@MyTeamLotus updates us on its programme: The programme this afternoon is to concentrate our work on the hard tyre. This will be the Prime for the first three races and we think everybody will do a lot of laps on it because of the consistency it has shown throughout testing
Vettel posts his best time of the day: 1m23.005s

Jaime Alguersuari
Alguersuari has completed four laps averaging 1m28.442s before returning to the pits
Kobayashi stopped because of a drive-shaft problem. Sauber is now looking at what caused it
Vettel back on track now
Could Mercedes be the first team to finish 1-2 during winter testing?
Followed by a 1m22.709s that puts him in seventh
Rosberg's opening lap is a 1m27.078s
Curt says: You probably won't answer me as usual , but are McLaren really really struggling this year? Doesn't look good from fans point of view at all.
Well, leaving pace aside, there's been a clear lack of running that is obviously affecting McLaren's preparations, and today is another example of that.
It would be a be surprise for everybody is McLaren in on top in the first races.
See, we answered you.
Well, leaving pace aside, there's been a clear lack of running that is obviously affecting McLaren's preparations, and today is another example of that.
It would be a be surprise for everybody is McLaren in on top in the first races.
See, we answered you.
Alguersuari has "L31" on his pitboard. Looks like a long run for him
Rosberg is now out in the Mercedes for his first lap of the day. He will have a little less than an hour to test the team's new upgrades
Alguersuari heads out of the pits
The track is clear and the green flag is out
Button has managed 38 laps in total today. Luckily for McLaren, there is another day of testing tomorrow, although unfortunately for the team, rain is on the cards
We are asked why McLaren didn't change Button's engine yesterday.
The answer is that the engine was probably fine yesterday.
The answer is that the engine was probably fine yesterday.
The truck is on the scene to lift the Sauber
That's the first red flag of the day, and the stoppage came on Kobayashi's 26th lap of the run, having pitted just five laps earlier
Kobayashi's Sauber has stopped at Turn 3
Red flag
Kovalainen is on the 15th lap of another long run, while Kobayashi is on the 25th, having stopped twice already
That's the fourth stop for the Spaniard during his 43-lap run so far
And now he keeps going again
Alonso pits, but this time he has stopped
@OfficialMGP responds to the angry Schumacher fans: To answer the queries! We expect rain tomorrow so switching now gives Nico the chance to run the upgrades in the dry and give his input.

Narain Karthikeyan
Some more news from the unveiling of the new Hispania car:
Karthikeyan sure he will quickly settle
Kobayashi and Kovalainen are the other men on track, both on long runs too
On the 37th lap of his race simulation, Alonso has posted his fastest too: 1m27.205s
Another update from @MyTeamLotus: First results from new front wing are positive. We'll be doing more work to maximise the benefits it brings. Also tried the DRS in race mode, sent Heikki out into traffic to make sure he's familiar with the system
We are still getting tons of questions on what McLaren is up to, but there is nothing new to report. Button was having an engine change and is expected to be out as soon as that is done
Now the Spaniard is back on the pace, with a lap of 1m27s
Alonso followed his 1m49s with a 1m56s

Kamui Kobayashi
Kobayashi has managed 17 laps during this sting. He pitted after ten laps, then continued
Back on track, Alonso is on the 36th lap of his stint, but that round has not gone too well, as he has posted a 1m49s
By: Matt Beer, Jonathan Noble, Mark Glendenning, Pablo Elizalde
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