Date - Friday March 11 2011
Driver - Jenson Button
Location - Circuit de Catalunya
Track length - 4.655km
Weather - Grey and cold. Maximum ambient temperature 15.0C, maximum track temperature 31.7C
Laps completed - 57
Kilometres covered - 265km
Best laptime - 1m25.837s at 12:05
After a one-day hiatus, the Vodafone McLaren Mercedes team resumed its final pre-season test of 2011.
For the penultimate day of running, Jenson returned to the cockpit, spending the morning going through pitstop practices and completing some flow-vis aerodynamic tests.
The focus then switched to a number of evaluation runs using the 'porpoise nose' measuring equipment mounted to the nosecone.
Despite stopping just before lunch to effect a precautionary engine change, the team was able to complete its morning run programme.
Making a late return to the track, the team was still able to carry out a number of short runs as it continued learning about the Pirelli tyres, during which it acquired further positive data.
Afterwards, Jenson said: "As today was my final day of testing, it was disappointing not to be able to put more mileage on the car. But I think we learnt some positive things: today was never about pace, as we weren't running lower fuel-loads, but there is pace in the car -- it's just been masked by reliability issues.
"Now, I'm looking forward to Melbourne: you can't under-estimate a team as determined as Vodafone McLaren Mercedes: we're all pulling together and we've got some interesting developments in the pipeline.
"Finally, I just want to add that today's events at the track are really put in their perspective by the terrible tragedy in Japan. Right now, my thoughts go out to everybody in Japan, particularly in the worst-affected area of Sendai. My heart is with them."
Driver for day four - Lewis Hamilton
Duration of test - Four days (March 8-9 & 11-12)