Sebastian Vettel to 'explore' in final four races to be stronger in 2012

World champion Sebastian Vettel says Red Bull Racing will use the final four races of the season to try and learn how to be stronger in the 2012 season.

The German driver clinched his second title at Suzuka on Sunday, after a dominant season that saw him wrap up the crown with four grands prix to go.

With the title already in his pocket, and with Red Bull nearly on the verge of securing the constructors' title too, Vettel says his team has now the freedom to try new things that may help them be even stronger next year.

"The best thing is that this season is not over yet," said Vettel in a post-race interview in Japan. "We still have four races to learn a lot and in a way a certain freedom to explore, to make sure next year we are even stronger and more prepared."

Vettel, the youngest ever double world champion at 24, hailed the progress made by Red Bull since the 2009 season, the German claiming the team is now on a different league.

"I think if you look at the team at the beginning of 2009 and now it's a completely different team," he said. "It's mostly the same people but I think we are all playing in a different league now, on a different level.

"You can see the trust we have. Every single one is able to trust in the one next to him or her. It's fantastic, and I'm very proud of what we have achieved as a team and very, very proud to be part of it."

And the Red Bull driver admitted he was struggling to accept he was a double world champion now.

"It was impossible to imagine. When I was a boy I loved racing and, to be honest, I was dreaming about Formula 1 but you never imagine you could be there one day. It is as confusing as the first championship in many ways, because it's so hard to grasp and difficult to understand.

"I'm obviously very happy, very proud, especially because I think the team did a great job. It's not easy to come back after the strong season we had last year and achieve a little bit more, so so far it has been great."