Here are some figures from my latest trip to Belgrade:
(2001 S8 manual)
There
2240.8km 208L
10.77km/L 6.7mpL 30.4mpg
Back
2162.7km 215.3L
10.45km/L 6.5mpL 29.5mpg
On the way back includes a climb up 2 smaller Swiss passes, which may account for the poorer mpg. Both trips include at least 400km of slow D-roads, the rest is motorway at 120kph or 130kph.
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