Mark Webber admitted that his Red Bull team were using Friday's practice sessions in Brazil to test parts for their 2012 car.
Although Webber is yet to win a race this year, his team-mate and recently crowned double Champion Sebastian Vettel's record-breaking year has helped the Milton Keynes-based outfit to secure their second consecutive Constructors' title.
That meant the team were free to take advantage of the dry conditions at Interlagos on Friday and test potential parts for their 2012 car.
He said: "It could have been our last chance to run in the dry with some wet weather coming, so it was our last test day, so there were some items we were looking at for next year, and a bit of reliability work here and there for Renault so it was a good day for us."
In spite of this, the Australian, who won the Brazilian race in 2009, was quickest in the morning session and wound up third fastest in the afternoon behind pace-setter Lewis Hamilton and Vettel who was second fastest.
"It was still reasonable in terms of the information you get and we get in terms of pace relative to the competition," said Webber.
"You still want to do some specific work for this weekend, no one is fully rigged up for 2012 today so you still read a bit into it."