Nico Rosberg was at a loss to explain his upturn in fortunes after winning the Brazilian Grand Prix for a second successive year on Sunday.
The German secured second place in the drivers' standings by seeing off the challenge of McLaren team-mate and world champion Lewis Hamilton in Interlagos.
Rosberg and Hamilton looked set for an enthralling duel when the pair almost made contact as the world champion attempted to pass on the outside at Turn One after the German had started on pole for a fifth race in a row.
Hamilton was unable to come as close as that again despite pushing hard and was left frustrated with the lack of opportunity to overtake on the famous circuit.
Rosberg had not won since June before his triumph in Mexico a fortnight ago and the German was not able to put his finger on why he has been able to return to the top of the podium.
"It was a good challenge from Lewis, but I was able to control the pace. We saw Lewis dropping off a lot with degradation and that confirmed it was important to take care of the tyres," he said.
"I am pushing now and I was pushing earlier in the season. I don't have an explanation for why now but just want to keep on going."
Rosberg then set his sights on ending the season on a high note in Abu Dhabi.
"I have been working hard all year. Lewis had the upper hand the whole season so I needed to turn it around. Two weeks in Abu Dhabi - I want to go for the win again," he added.