Cheers for this - i'll have to read through properly tomorrow - the missus is back from work and frowning!
I only get a little over 300 miles per tank, is that normal for a daily commute (average speed over a tank of fuel is only 25mph!!). At this sort of mpg its gonna be way expensive!!
For commuting that is normal mpg. I commute everyday to london, 55 miles each way, average about 31 mpg and a average speed of £55 in total. But for just motorway cruising at 80/90 occasional 100+ you get 29/30, so if you do the legal limit (french laws are quite strict) you can get close to 35mpg doing 60/70.