I'm well at home now, and can report that the average FE for the whole trip ended at an average of 10.4 L/100km (22.6 mpg US) over 4100 km (2550 miles), but that is not disappointing as the car was loaded even heavier on the return (GF and shopping in Paris is a heavy combination :P ), A/C was used almost all the rest of the trip, and average speeds over maybe 75 % of the total distance were somewhere between 120 and 130 kph (75-81 mph).
The trip was great by the way, despite the car trouble on the way down
