Mark Webber says he is ready to bid farewell to F1 as the Red Bull man prepares for his final race in the sport this weekend in Brazil.

The 37-year-old will leave F1 for pastures new in 2014 having inked a deal to lead Porsche's return to the highest level of sportscar competition.

The Australian will hope to add to his win tally at a circuit where he has already won twice in the past but he said he was still sure his decision to quit F1 had been the right one.

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"I feel ready for Brazil and am looking forward to a bit of a different chapter in the future," he said. "There would be something wrong if I was disappointed to be finishing, because that's the reason I've made my decision, as a sportsman or woman that's why we all make those decisions: because in the end the fire is not quite what it was, and you've got to accept that.

"So the time is good for me, one to go and we'll put on a very good performance, I believe I can do that in Brazil. I'm happy I'm still driving pretty well, making my mark so to speak, but I've had my time. I've enjoyed it and achieved a few things, so let the guys do their thing in the future."

Webber added that he was pleased that his final outing in F1 would come at one of his favourite circuits on the calendar.

"Interlagos is one of my favourite races, the atmosphere at the track is fantastic," he said. "The circuit sits in a bowl, giving it the feel of an amphitheatre. It's like Brands Hatch in the UK, where the crowd sits almost on top of the cars and it results in a fantastic atmosphere on race day. The race has been good to me because I've won it twice and I just enjoy being in Sao Paulo."