Jenson Button headed the second day of the first test of 2014, setting a fastest time three seconds quicker than Tuesday’s best.
Wednesday was McLaren’s first test outing of the week as Button completed 43 laps on a day that saw a marked increase of mileage over Tuesday’s running.
Kimi Raikkonen continued Ferrari’s strong showing by setting the second-fastest time, albeit .716s behind Button’s fastest.
“Everything’s new with this car so I am amazed we were able to go round and do as many laps as we did today,” Button said.
“There’s a lot we can do overnight, which is exciting, and I’m looking forward to getting back in.”
Button will share his car with team-mate Kevin Magnussen on Thursday.
Wednesday wasn’t without incidents: Esteban Gutierrez disrupted Sauber’s running schedule when he spun into the gravel at turn five, bringing out the red flag, while Perez’s Force India ground to a halt at the first corner in the afternoon.
Perhaps the most notable exclusion from the day’s running was Sebastian Vettel, who was forced to end the Jerez test early after a battery problem caused the team to opt out of the remainder of the day’s running.
Vettel, who completed just 11 laps in the two days of running, now hands the car over to new team-mate Daniel Ricciardo for the remaining two test days.
The surprise result was Nico Rosberg, who registered 97 laps over the day.
Full results below