McLaren racing director Eric Boullier says the team is "working flat-out" to improve its car before the end of the season.

Both McLarens finished in the top five in Sochi, pulling the team clear of Force India and increasing hopes that it may be able to challenge Ferrari for fourth in the constructors' championship. Boullier said the result in Russia has motivated McLaren even further as it continues to develop its car ahead of this weekend's United States Grand Prix.

"Off the back of our improved pace in Russia, the whole team is looking forward to returning to Austin after a three-week break," Boullier said. "It's a very popular track that's already made its mark on the Formula 1 calendar, and the drivers and team personnel alike really enjoy going there. The organisation of the event and the facilities at Austin are very impressive, and both races since its opening have been a success.

"As we move closer to the end of the season we're continuing the development of our car, working flat-out to extract the maximum performance from our package as each race goes by. Our result in Sochi gave us increased confidence, and we come to Austin with the firm intention of building on this recent form with a strong finish for the team and boosting our points buffer over Force India in the Constructors' standings.

"Of course, though, it goes without saying that, despite everything, our thoughts and prayers are firmly with Jules Bianchi and his family as we await news on his condition."

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