Button: We made gearing error
McLaren drivers Jenson Button and Sergio Perez were left to bemoan the MP4-28's lack of straight-line speed in the Italian GP after the team's 50th anniversary race yielded just a solitary point.
The pair finished in disappointing tenth and 12th places respectively at the end of Sunday's 53-lap event after spending much of the race in traffic and then losing late ground to the out-of-sequence Lewis Hamilton.
Button, who just managed to keep the Lotus of Kimi Raikkonen at bay over the final lap to pick up the final point, pointed squarely at incorrect gearing on the MP4-28 having been unable to pass the Toro Rosso of Daniel Ricciardo or Romain Grosjean in the other Lotus.
"I think if we raced and there were no other cars we would have had pretty good pace," he joked to Sky Sports F1's Natalie Pinkham.
"But we made a mistake today - we geared it wrong - and I was hitting the limiter so early.
"The problem is, for the start of the race you can still have a little battle and maybe overtake and I got past Lewis. But as soon as the fuel starts coming down your cornering speeds go up and so the end of straight speed goes up - and we're on the limiter as soon as we deploy DRS.
"So that's why when we're in traffic cars can just pile past us. I don't think our pace was too bad, I think our pace was quicker than the Toro Rossos, but we couldn't get past them. We were just sitting ducks then."
Button added that he was nonetheless surprised to make the finish given he flat-stopped his tyre with a quarter of the race to go.
"I just flat-spotted my tyre into turn one pretty massively - I'm surprised it's still got air in it - and then I had that for the last 15 laps," the 2009 World Champion added.
"So it wasn't a great race. It would have been a lot better if it stopped ten laps early!"