you rarely have to fill the thing the right up unless you like running on fumes and picking up the cr4p from the bottom of the tank!?!? I've found with a range of 60-80 miles left it's costing £40 - £45 to fill her up.
Mileage wise I'm getting about 320 from the trip and thats all 70% motorway I would say.
It does depend on your right foot and I am quite light with it. As mentioned in anoher post, I wouldn't trust the "miles left"
The other day I :
1) Filled her up computer said range 350 miles
2) Pootled down to Chester and back (100 mile round trip almost)
3) After this trip the computer said range 370 miles!!!! GREAT!!!
4) Quick blast to B&Q (Dropped 85 miles in about 5 mile round trip
so... I think the car is a good all rounder, not many other 230bhp cars give 32mpg +