Kimi Raikkonen is refusing to get carried away with the pace of the Ferrari in pre-season testing.
The Finn has set the fastest time on both his days in the car and the third quickest lap of the week overall.
Asked if the team was optimistic after its strong showing in the first week, Raikkonen said: "You are optimistic every year, but then where it turns out to be at the end of the year is hard to say.
"But we have learned our lessons from the past years and the team has done a good job over the winter.