Aston Martin's Sebastian Vettel will take a grid penalty at the United States Grand Prix after exceeding his engine allocation for the season. The four-time Formula 1 world champion, a winner at Austin's Circuit of the Americas with Red Bull in 2013, has been struggling to score points recently with only one top-10 result in the last nine races. 'I think we are heading into, let's say, a difficult weekend,' the German told reporters. 'We are changing the engine and therefore we will have a penalty. 'We will see what we can do from where we start, and nevertheless, looking forward I think we can be strong here. How strong? We will see.' Drivers are allowed three engines to last the season...
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