Audi A8 3.0 TDI Idling Speed

alan@abaca.co.uk

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Can anybody tell me the correct idling speed for my car, please? It was recently serviced (first time 16000 miles) and since then I beleive it is idling to fast and I beleive my mpg has dropped.
 
Not sure to be honest alan, but my 4.2 QS idles at around 600rpm.