Heikki Kovalainen ended the first day of practice for the United States Grand Prix with the fifth fastest time, despite track-time on his Lotus debut falling short of the expected three hours.The Finn, called up as replacement for countryman Kimi Raikkonen after he decided to have season-ending back surgery, had not sampled the E21 before the morning practice session, and then found his first lap delayed by heavy fog, which descended on the Circuit of the Americas with little warning. After a long hiatus, Kovalainen was the first driver out on track, but the session was interrupted for a second time after the medical helicopter developed communication problems and needed replacing.Once...
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