Red Bull's encouraging one-three finish at the Canadian Grand Prix last month was followed by an 8-DNF in Austria and then 3-5 at Silverstone. The team has won all eight F1 drivers' and team's championships across 2010 to 2013 but Mercedes appears in a class of its own this year. It's been a sobering campaign for Sebastian Vettel, the all-conquering champion of the past four seasons, who has failed to finish a third of the races so far. 'We have tried lots of stuff to improve, but (Mercedes) are doing the same thing,' the German said. 'We are waiting for bigger steps to happen to close the gap even more which at the end of the season we can judge a lot better - then we know what we can do...
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