Muller tops first Sonoma practice

Yvan Muller was fastest in Saturday morning's first World Touring Car Championship practice session at Sonoma. After suffering turbo trouble in Friday's test, Tom Chilton produced a greatly improved performance in his Arena Ford to take second, just 0.053s off the world champion's 1m46.398s lap. "On Friday we had a pipe come out on the turbo, so I was effectively driving a 1.6-litre atmospheric [rather than a turbo car]," said Chilton

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