Audi Sport head Wolfgang Ullrich says saving tyres key to Mattias Ekstrom's pole
|By Jamie O'Leary||Saturday, April 28th 2012, 14:22 GMT|
Mattias Ekstrom's decision to save his tyres at a crucial stage of DTM qualifying was instrumental in the Swede taking pole position at Hockenheim, according to head of Audi Sport Wolfgang Ullrich
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