Global Motorsport Media
Sebastian Vettel will have a tougher time in 2012, according to his countryman, friend and rival Michael Schumacher.
It is possible Vettel, 24, will secure his second consecutive drivers' title this weekend with still five races to follow Singapore.
"Of course Sebastian has had a great performance this year," German Schumacher, who in 1995 similarly won his second title in successive seasons at Benetton, told Sport Bild.
But the 42-year-old, tipping Red Bull's rival teams to speed up in 2012, added: "I don't think he runs the risk of getting tired, but it will be more difficult for his team.
"The gap will be less. This year there have been races in which no one was able to follow him (Vettel). That's not going to happen again."