Mark Webber doesn't believe Red Bull will have it all their own way in Spain despite a confident start to the weekend's proceedings.
In action around the very warm Circuit de Catalunya for Friday's practices, Red Bull lost out to rivals McLaren as Jenson Button went quickest ahead of Sebastian Vettel.
As for Red Bull's Aussie, he was seventh quickest with a 1:24.065, which him 0.666s down on Button.
Webber, though, insists he has no complaints with how his day progressed despite a few track excursions including one that left a sandpit of gravel out on track.
"I'm pretty happy actually," said Webber. "We got a lot of mileage in, apart from the driver running off the track and getting a bit of gravel rash!
"You get one timed lap on the option, basically. Everyone gets one timed lap, so that's the lap times that everyone sees on the timesheet at the end of the day.
"There's a huge amount of work that goes on around that. That's what we've got to pull together tonight and work on tomorrow.
"There's some fast cars out there. McLaren are quick, Ferrari are quick, we're quick, Mercedes aren't hanging around, and Renault as well."
Looking ahead to Saturday's all-important qualifying, Webber concedes that while a top starting position is crucial, saving tyres for Sunday's grand prix will also be very important.
"It's nice to finish the first lap in a good position. Obviously I capitalised on pole in 2010, I didn't capitalise on it last year.
"I think the winner has generally come from the top three for the last thousand years. You need to be at the front at the end of the first lap for sure, and then just go from there, and people will just be covering each other off at pit stops, to be honest.
"I'm not sure how many stops the race will be, but the tyres this morning weren't particularly impressive.
"I think that qualifying could be compromised to look at how many sets of tyres you have for the race."