Took our recently-bought 965 Manual to La Rochelle last month.
We travelled down the night of the Le Mans 24h so had to detour somewhat on the way there - but on the way back drove up the Mulsanne straight (albeit in the wrong direction) - which was phenomenal!
South London - Reigate - Chunnel - Rouen - Caen - Rennes - Nantes - La Roche-sur-Yon - La Rochelle.
Various driving locally which is great fun on the French "D" roads especially with "La priorité à droite"!!
La Rochelle - Tours - Le Mans - Rouen - Boulogne-sur-Mer - Chunnel - South London.
Only spent about £25 on péage (tolls), completed 1200 miles and averaged 30mpg - can't argue with that!
(Although couldn't live with French petrol prices - €1.65 for 95 UL (that isn't sodding E10 rubbish!) OFF the autoroutes - about €1.79 otherwise!)
Cheers