Sebastian Vettel and Mark Webber might have kept Red Bull's powder dry in FP1, but in Friday afternoon's second practice session at Austin's Circuit of The Americas they saw off all competition.Vettel set a best time of 1m 37.305 on the medium compound tyre to finish 0.115s ahead of his Australian team mate on 1m37.420s. The Mercedes duo of Nico Rosberg and Lewis Hamilton got closest, but they were another 0.480s and 0.653s further back respectively. Hamilton was driving with a new chassis after a pre-event inspection revealed two large cracks in the old one.Kimi Raikkonen's replacement Heikki Kovalainen demonstrated his mettle with the fifth fastest time of 1m 38.073s for Lotus, right...
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