Button not feeling added pressure

With two races to go, the British driver needs to finish in third place at Interlagos to secure the title no matter what his rivals Rubens Barrichello and Sebastian Vettel do in the race.

Although Red Bull driver Vettel said the pressure is on his two rivals because of his gap to them, Button reckons all three men are feeling the same pressure because of the situation they are in.

And Button says he is excited about trying to clinch the title in Brazil, but insists he will not change his approach to do it.

"Sebastian saying the pressure is on us is not quite the case, it is the same for all of us. We are all fighting for the championships, it is the first time for me, Sebastian and maybe Rubens," Button told a news conference.

"It is an exciting situation to be in, but I am the one with the lead.

"We are all fighting for something that is far greater than we have achieved in the past."

He added: "I woke up with a smile on my face, I don't think it adds to the pressure knowing that you could win the world championship, it adds to the excitement for sure. I am positive."

The Brawn driver, who has been unable to fight near the front in the last two races, is optimistic his team has made some progress that will help him this weekend.

"We have a few changes that should help us around a circuit like this. It should be a good step forward," he added. "The last race was obviously difficult because of the starting position and the mistake on Saturday with the yellow flags.

"The pace has been good, but it is always difficult when you start far back, it is difficult to overtake these days in F1, every opportunity I have had to make a move I've made, but starting where I did was difficult to pick up good points.

"Coming into last two [races], I am confident I have a good feeling with car and the upgrades should help us quite a bit.

Button, winner of six of the first seven races of the season, has finished on the podium just once in the last eight grands prix.

The Briton, however, says he has been doing the best possible job in some difficult situations rather than just picking up points by not taking risks.

"I haven't purposely gone out to finish in the points and not win races," he said. "I go out to try and win every race I compete in and I have led championship all the way through the season.

"It is a different situation for the people who are chasing, for sure. They need to be more aggressive than I am, for sure. I don't just want to finish in the points, that has never been my objective, but there are situations you don't want to put yourself into. I think I've had a reasonably good balance."

The championship leader, whose team needs just half a point to win the constructors' title this weekend, said it will be a dream for the Brackley-based to win the championship after all the doubts about its future at the beginning of the year.

"It is an amazing story and it is a Hollywood movie, if it happens," he said. "It is not certain yet. I think the team has been through a lot this winter. It was a difficult situation over the winter, a lot of them found it tough, but in the end we got the deal done and were able to come racing.

"If we come away with the constructors' [title] in the first season of Brawn GP, it will be a very emotional moment for everyone, as it was in Australia when we finished 1-2.

"It was the first time I've seen Ross speechless and if it happens here or Abu Dhabi it will be the same. For Ross to win the title with his own team is a greater achievement that what we had done in the past."