Red Bull team boss Christian Horner says they're resigned to the likelihood that Sebastian Vettel will pick up an engine penalty at the forthcoming United States Grand Prix.The World Champion said as much on television after finishing eighth in Sunday's Russian GP and Horner later told journalists that the engine Vettel used in Sochi – his fifth of the season – is reaching the end of its life-span.'We have to look after what's happened here but I think the reality is that Sebastian will take a sixth engine in Austin because it's inevitable he's going to have to use it,' he said. 'I don't think this engine can really go too much further.'Most drivers are now reaching the limit of...
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