Audi tops final Sebring practice

Audi maintained its stranglehold on the top of the timesheets in final practice for the Sebring 12 Hours. Romain Dumas ended up fastest in the only one of the three R18 TDIs to take to the track in the fourth session. The other two R18s had completed their test programmes ahead of Friday afternoon's qualifying session for the FIA World Endurance Championship opener and did not run

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