The best I've got from my RS TDi was 5.4l/100km driving from Mildura to Melbourne (@ 540km trip with last bit across inner Melbourne to get from the Calder to Nunawading). That was with just myself in the car and an average speed of 98km/h. Most of the trip is flat with speeds limits 100km/h to 110km/h and I normally do @ 8km/h over the limit. Around Kyneton/Mt Macedon it does get a little hilly though.
My Ocy has now done Melbourne to Mildura & back 13 times now. I find when you have all the family plus their gear it goes up. Also with the Bluefin tune the best I've got is 5.9l/100km even though your not using the xtra power sitting at 110km/h (admittedly with all the trips I've done with the Bluefin, I've also had the family with me). On average without the Bluefin I get @ 5.7l/100km, with it @ 6l/100km.
Have also found when doing under 100km/h and cruising, the average is under 5l/100km.
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