– Formula 1 tyre supplier Pirelli says drivers and their teams will need to overcome a "very big workload" during final practice for the Russian Grand Prix, after a disrupted first day at Sochi Autodrom.Friday's opening session was delayed by a diesel spillage and, although drivers hit the track with an hour left on the clock, the affected section from Turn 8 through Turn 11 remained damp throughout.In the afternoon, heavy rain showers forced drivers to use Pirelli's wet compounds from the outset, leaving teams with limited running on the Soft rubber and none at all on the Super Soft."It was a largely inconclusive day," said Pirelli motorsport chief Paul...
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