World champion Sebastian Vettel of Germany yesterday said that his back-to-back title triumphs in the last two years would count for little when the 2012 Grand Prix season gets underway in Australia on March 18.

Sebastian Vettel

On the day when Red Bull used the Internet to unveil their new "fourth generation" RB8 car, the 24-year-old dwelled on his hopes of making it a hat-trick of world titles.

"It's difficult to say. Every season we start from zero again," Vettel said. "Until we put them (the cars) on track to race each other we don't really know. So we'll see, but I'm as confident as I can be at this point."