Fernando Alonso has downplayed suggestions that he isn't motivated following a lackluster performance in Abu Dhabi.
Alonso and team-mate Felipe Massa struggled with an uncompetitive at Yas Marina as Ferrari endured one of its worst weekends in recent memory.
Although the two-time world champion finished an admirable fifth in Abu Dhabi, he finished more than a minute behind race winner Sebastian Vettel and admitted after the race that it is starting to become a challenge for him to perform at his best consistently.
"It's very difficult. Obviously I have been 12 years now in F1 and more in the smaller categories and I always do 120 per cent every race," Alonso told Autosport.
"Also, I have a lot of attention on me, a lot of expectation in every race I go to to see what I can do different or to improve the result so I know that I always need to do extra, and that's my motivation."
The Spaniard added that finishing second in both the Drivers' and Constructors' Championship would represent a successful season to him.
His fifth place on Sunday has opened up a gap of 34 points to Kimi Raikkonen in third - a gap the Finn is unlikely to close in the last two races - but Ferrari face a far stiffer challenge in the Constructors' race.
The Maranello team is 11 points behind Mercedes, who has consistently been faster than Ferrari this season, particularly in qualifying.
"The motivation now is clear, second in the constructors', still not the main goal but it's still a good goal for us," Alonso continued.
"Second in the constructors' championship will be a reward for me knowing that we don't have the second fastest car as we see every weekend.
"If I finish second in the [drivers'] championship, it's a little personal win.
"Obviously, I race to win the world championship and finishing second is very sad, but from a personal point of view in the season it would be a very good 2013 championship [performance].
"It is true, we need to do better.
"There have been some weekends now where it's not only Mercedes that worries us, it's Lotus, it's [Nico] Hulkenberg, it's Toro Rosso, McLaren so we are dropping a little bit too much and we need to do better.
"The car will be the same in Austin and Brazil, so we need to do better on the track in the setup, optimising it circuit by circuit.
"[And] the drivers need to do better and do perfect laps all weekend because we need to beat Mercedes."