Mercedes GP driver and seven-time world champion Michael Schumacher topped the timesheets on the second day of testing at Jerez.
Despite setting his 1m20.352s lap, Schumacher struggled to stabilise his laps throughout the day, which seemed to demonstrate that Mercedes are still behind Red Bull, who were over a second faster than the German marque over similar 10-lap stints.
Following on from yesterday, Felipe Massa completed the most laps once more with 116, and mainly focused on heavy fuel loads. The Brazilian was the only other driver to dip below the 1m21s bracket with his longer run times fluctuating between 1m26s and 1m28s.
Getting his hands on the MP4/26 for the first time, Jenson Button and McLaren took third fastest time. The team went public with their day's programme before the test started. The 2009 world champion spent the morning running installation laps, performing systems checks; but never ran more than 6 laps at a time. His lap times varied between 1m23s down to 1m21s on a couple of occasions, registering only 69 laps for the day.
Setting his fastest lap at the start of another 10-lap run, Jaime Alguersuari was fourth for Toro Rosso on a 1m21.214s lap. Completing 72 laps in total, the Spaniard held a steady pace with his time varying little from the 1m22s but caused one of the day's red flags by spinning off at Turn 9 before concentrating on shorter runs in the afternoon.
Undertaking duties for Red Bull once more, Mark Webber set an impressive pace as he concentrated on longer runs on the RB7. His best lap, a 1m21.613s, was set in the middle of a three lap stint but his heavier fuel load runs were only slightly slower and served to underline the cars' potential.
Adrian Sutil had another relatively quiet day in terms of impressive lap times for Force India as he totaled 73 laps for the day and a best of1m21.780s, to finish 6th overall.
Sergio Perez claimed 7th with a 1m21.857s lap and covered a lot of mileage for Sauber, but limited his runs to a maximum of five at any one time. The Mexican rookie was soon back in the garage after crashing his C30 between Turns 7 and 8 and damaging the front end of his car.
Representing Marussia Virgin Racing, Timo Glock concentrated on installation laps before longer runs around lunchtime. The German managed to set his fastest lap - 1m22.208s, within the final hour of the session to claim 8th fastest.
Vitaly Petrov concentrated largely on short bursts for Renault but failed to generate much interest as he ended the day in 9th on a 1m22.493s, having completed a total of 65 laps. The Russian could have had more track time to develop the R31 but he too caused a red flag after spinning at turn 2 halfway through the morning session.
Driving for Williams, Pastor Maldonado left a slightly sour taste in the team's mouth after crashing heavily at the exit of Turn 4 with little over an hour remaining of the day. Skipping over the gravel trap, the Venezuelan smacked the tyre wall and left the mechanics with a job to do before Rubens Barrichello takes over tomorrow. He ended the day in 10th on a 1m22.591s and completing only 38 laps
It was another frustrating day for Williams as they had already lost a large chunk of track time to a problems with their KERS system after it displayed a warning signal in the morning.
Another productive day for Team Lotus saw Jarno Trulli working on longer runs in the morning and lapping consistently in the 1m23s and1m24s before retiring around mid-point. The team would not confirm what caused the mechanical problem, only that replacement parts would have to be sent from it's UK base overnight.
See also: Jerez test times 2011-02-11