In the rain on Wednesday, Vettel set the pace, topping Lewis Hamilton while his team-mate Mark Webber took advantage of the sunshine on Friday to set the day's best time, a 1:19.299. Vettel, though, has ruled out any talk of his team being the ones to beat, saying fuel loads could have played a part in Red Bull's pace.
"It's true we did a couple of good runs, but it's hard to know what fuel loads the others were carrying," the German told the official F1 website.
"Next week in Barcelona we expect to improve the car even more - how much we succeed, we will see.
"I have read that Mercedes and McLaren will bring really big updates, so let's wait and see next week."
Source: Planet-F1
