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Live timing and coverage: Pre-season testing day four

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Follow live coverage of the final day of the first pre-season test from Circuit de Barcelona-Catalunya with F1i.

After three days of testing so far, Mercedes remains in ominous form as it continues to complete impressive mileage. Such has been the reliability of the new W07, the team is going to split the driving between both Lewis Hamilton and Nico Rosberg for the remainder of pre-season, with both driving for half a day each again on day four.

Live timing and coverage from Barcelona

Mercedes is also set to have a new nose on the car on Thursday, which was ready to go on day three. The team opted not to use the upgrade during yesterday's running as it was still evaluating other new parts - including its innovative floor - and wanted to maintain a stable baseline.

Kimi Raikkonen will hope for more mileage on Thursday having been limited to just four laps on Wednesday morning, though the Finn was happy with Ferrari's recovery in the afternoon session.

Another team looking to improve on disrupted running will be McLaren, with Jenson Button's third day schedule being curtailed early due to a hydraulic leak. Fernando Alonso returns to the car for the final day of the first test having completed more than 100 laps already on Tuesday.

You can follow live coverage of both pre-season tests - including live timing - on F1i's live page here, while there are also galleries of all of the new cars.

Running will take place from 0900-1300 and 1400-1800 every day throughout the two tests, with the first taking place from February 22-25 and the second being held from March 1-4.

Follow live coverage and timing from pre-season testing here

Who is driving when during the first pre-season test

GALLERY: Pre-season testing day three

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Andrew Lewin

Andrew first became a fan of Formula 1 during the time when Michael Schumacher and Damon Hill were stepping into the limelight after the era of Alain Prost, Nigel Mansell and Aryton Senna. He's been addicted ever since, and has been writing about the sport now for nearly a quarter of a century for a number of online news sites. He's also written professionally about GP2 (now Formula 2), GP3, IndyCar, World Rally Championship, MotoGP and NASCAR. In his other professional life, Andrew is a freelance writer, social media consultant, web developer/programmer, and digital specialist in the fields of accessibility, usability, IA, online communities and public sector procurement. He worked for many years in magazine production at Bauer Media, and for over a decade he was part of the digital media team at the UK government's communications department. Born and raised in Essex, Andrew currently lives and works in south-west London.