Sebastian Vettel says he's heading into a difficult US Grand Prix weekend following Aston Martin's decision to fit the German driver's car with a new Mercedes engine, a change that warrants a grid penalty. Drivers are allocated a maximum of three Internal Combustion Engines for the season, with any additional elements inevitably triggering a mandatory grid drop. Vettel has scored only four top-ten finishes this year, the last of which was a P5 attributed to the Aston driver after last summer's truncated Belgian Grand Prix at Spa. The four-time world champion, who previously suffered an engine failure last month at Zandvoort, looks set for an extension of his barren run in Austin....
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