In a day that became increasingly overshadowed by the off-track escalation of the FIA/FOTA war, it almost went unnoticed in many quarters that Sebastian Vettel and Mark Webber dominated practice in their revitalised Red Bulls.
Vettel set the fastest lap of the day, 1m 19.400s, in the morning session, with Webber right on his tail, both expressing great satisfaction with the performance of a heavily upgraded aerodynamic package.
Adrian Sutil in a Force India set the third fastest time overall of 1m 20.141s in the afternoon, just faster than championship leader Jenson Button's best morning lap of 1m 20.227s which was 0.827s shy of Vettel.
"They're too quick. I think we're going to have trouble this weekend," admitted Button’s boss, Ross Brawn.
Button was equally downhearted after the practice, but hoped for an improvement before qualifying today.
"We tried a few different evaluations with the aero today and initially struggled as I had no grip in either the high — or low — speed corners," Button said.
"The wind also really affected the car's performance today.
“But we made improvements towards the end of the afternoon session so we have some good information to look at tonight to try and make further progress before qualifying."
Lewis Hamilton spent the day fine-tuning the balance of his McLaren without its KERS system, which is less beneficial here, and working with some minor aerodynamic modifications.
"It's no secret that we're lacking speed in the faster sections," said the world champion who has lived in fellow Brit, Button’s shadow this season. "But the car wasn't too bad today."