The final session of free practice for the 2013 Formula 1 Petronas Malaysia Grand Prix at Sepang on Saturday turned things on their head as a jump in track temperature to 40 degrees Celsius changed some cars for the worse and some for the better.Sebastian Vettel seemed to be in all sorts of trouble for a while, as he and Red Bull team mate Mark Webber slithered about, but right at the end he beat Lewis Hamilton to fastest time with a lap of 1m 36.435s on the medium compound Pirelli tyre. Hamilton's best for Mercedes was 1m 36.568s, and he had Force India's Adrian Sutil right on his tail with 1m 36.588s. Every driver discovered that the medium tyre has a very finite life, and as Hamilton...
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