I wonder what Mercedes might want the FIA technical department to clarify this week? With altitude at Interlagos coming into play, both the Ferrari and Honda power units had the edge. It wasn't a big advantage, but it was there.
Interlagos is a bit like Spa, in that the first and last sectors are all about straightline speed, while the middle sector is about car grip. In reality, there wasn't much in it either way between the top three teams, as far as top speeds or sector times were concerned. The three are well within the window of what's called set-up compromise.
Red Bull has, without doubt, a very good chassis and with the Honda power unit it seems to have that little advantage when racing at altitude. In Mexico and again in Brazil, which is at around 800 metres, the Honda power unit seems to be a step better than at other circuits closer to sea level.