Vettel's latter half of the season has been every bit as dominant as 2011, and it would be a fitting historical parallel if he again seals the championship in Japan with four races up his sleeve. Only Schumacher in 2002 (six) and Nigel Mansell in 1992 (five) had more races to spare in clinching a title.
Asked about his opportunity to seal it in Japan, Vettel said: "We had the incredible chance, two years ago, to do so. We did it, but there are still a lot of points to get, even though it looks very good for us.
"The car is working ... it's on the edge, to be honest, more so than you would probably think from the outside," Vettel said.
The only edginess apparent to observers is how the Red Bull manages its wearing tires in the closing stages of the race, but that is true of all teams this season on the Pirelli rubber.
Romain Grosjean, who stayed on Vettel's tail through the first half of the grand prix in Korea when so many others have watched the German drive away into the distance, said he and teammate Kimi Raikkonen would have challenged the Red Bull in the closing stages if not for the two safety-car periods that allowed the German to nurse his tires for a few laps.
"It seems that every time there will be a battle with Seb, there's a safety car coming," Grosjean said. "The last stints would have been pretty epic without the safety car ... it would have been close."
Lotus looms as the main challenger to Red Bull this weekend, having shown improved form in Korea its first race with a new, longer-wheelbase car.
With all teams now turning their resources toward designing their radically different 2014 cars with V6 turbo engines, and with only a one-week break between Korea and Japan, the pecking order of teams at Suzuka is likely to be very similar to that seen at Yeongam.
-AP