On the topic of Brazil 2015 and outlook onto 2016 and the pace of the Ferrari, James Allen posted this article...
http://www.jamesallenonf1.com/2015/11/s ... e-in-2016/
James Allen wrote:Vettel finished 14 seconds behind the race winner Nico Rosberg’s Mercedes after 71 laps, which is an average of 0.2s per lap deficit to the world champion car. It still sounds like a lot, but it’s the kind of margin that can be bridged over a winter. The qualifying deficit remains the one Ferrari must overcome for Vettel to consistently challenge for the title.
Although he was never close enough in the race to make a move on either Mercedes, he did disrupt them by switching strategy and overall was delighted with the relative pace.
Found this on James Allen site which I felt was interesting. I don't agree though; I think the Ferrari seemed quicker because they were on a 3 stop from the beginning, which led to Mercedes also going onto "plan B" when Vettel stopped early. Had Mercedes targeted a 3 stop from the beginning, they would have driven faster (budgeted the tires differently for fewer number of laps by running a higher pace) which would have led to an overall higher gap.
I remember looking at the gap to Ferrari about a third into the race (lap 24) and it was already at 7 seconds if I recall correctly. Had that relative gap increased linearly, the Mercedes could have been finished as much as over 21 seconds ahead. That would be roughly 0.3s a lap in Brazil. A lot can happen until 2016, but I don't think Mercedes is standing still either.
One thing is for damn sure though; Vettel is impressive in that Ferrari.