Sebastian Vettel thinks the Spanish Grand Prix will give a good indication of how the race for the championship will shape up over the rest of the season.

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Formula One has been unusually unpredictable this year with four different winners in the first four races. The Circuit de Catalunya is a favoured testing venue for the teams as it features a mix of high-speed, medium and slow corners and the Red Bull driver believes a car that is competitive at Barcelona should be competitive everywhere.

"Of all the current GP tracks, Barcelona is the one that we know the most because we have done so much testing there in recent years," he said. "That said, the knowledge that you gain at the tests doesn't always help due to the changing wind direction that occurs there, which can sometimes give you a nasty surprise, especially into turn one.

"But in general, a car that functions well aerodynamically in Barcelona will work everywhere - so it will be an interesting weekend. We have been working on the package for Barcelona at this week's test, but we will still have set-up work to do there on arrival."

Team-mate Mark Webber said Red Bull goes to the Spanish Grand Prix with boosted confidence following this week's Mugello test.

"It's the first European race of the season, so it will be all hands on deck after a successful Mugello test. It was a tricky start to the test, but it finished off well and we head to Barcelona with good miles on the car and an understanding of some new avenues. It's tight amongst the teams, so we're mindful that we need to get everything right to get a good weekend."