Jenson Button admits he was "a bit emotional" after the Italian Grand Prix following a tricky end to the race.
It was a trying afternoon at Monza for the 2009 World Champion as he started ninth on the grid, but he could only manage to pick up one point - McLaren's only one of the weekend.
He often found himself stuck behind the wrong cars while the wrong gear rations also played a major role in his inability to finish higher.
"Today was tough. I think our pace was better than 10th, but we got stuck behind the Toro Rosso and couldn't overtake," said Button.
"The problem was that as soon as the fuel load comes down, the straightline speed is far greater. As soon as we followed anyone we were in a difficult position.
"We got it wrong with the ratios and it's a problem we will hopefully solve for the next one.
"When we are DRSing we were stuck at 331[km/h], and everybody is passing by at 340. We made a mistake."
The McLaren driver was eighth with less than 10 laps to go, but he was a sitting duck for those behind him as had problems with his rubber.
"I flat-spotted the tyre with about 15 laps to go so it was like driving with Lego tyres so it has made me a bit emotional."