In Singapore, Lewis Hamilton produced perhaps his best lap of the season in qualifying making no mistakes. The Brit went on to take the full 25 points as Vettel finished third.
In Mexico, Vettel was asked if he lost the fight in Germany or Italy.
"None of the two, to be honest. For me it was more Singapore," Vettel told reporters.
"I think from Singapore onwards we just didn’t have the pace to keep up with Mercedes for a couple of races and then obviously some other things happened on top that didn’t help and we couldn’t score the points due to mistakes that we did, mistakes that I did."
The German admits he doesn't tend to look back on his home race. Prior to that Grand Prix, he looked in pole position to go on and win the championship. A semi-wet track caught the four-time World Champion out.
"I can’t be too hard on myself with what happened in Germany because I’ve done much bigger mistakes this year but obviously it was the most costly one. Unfortunately, it’s part of racing: when you push you might be sometimes pushing a little bit too hard. I chose the wrong corner as well," added Vettel.
Can he pull it back next year?