Follow live coverage of day four of the final pre-season test from Circuit de Barcelona-Catalunya with F1i.
The teams have just one day of testing left to prepare their cars for the start of the 2016 season, with Friday practice in Melbourne just two weeks away. Mercedes will end testing with by far the most mileage of any team over the past eight days, but there were some encouraging lap times from Ferrari and Williams on Thursday.
The final day sees Mercedes run both drivers, while Haas will do the same. Romain Grosjean was scheduled to drive throughout the day but lost running for Esteban Gutierrez - who completed just 24 laps at the start of the week - means the Mexican driver will take over in the afternoon.
Sebastian Vettel rounds off the test for Ferrari while Jenson Button is back in the improving McLaren. Rookies Jolyon Palmer and Rio Haryanto will both be looking for more serious mileage ahead of their race debuts in a fortnight.
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 final test, which runs from March 1-4.
Follow live coverage and timing from pre-season testing here
Who is driving when during the second pre-season test
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