Mines extremely lucky if it does 1000 miles per year so I'm not the best to give true running costs, but as Paul says, your lucky to get 23 mpg, and mine also used £80 of V-Power on Saturday, I just love the way it cruises on motorways, so effortless, stable and planted at "some" mph
You will think your doing really well for fuel, until it goes below half a tank and then it plummets! I used the lower half of the tank and then some more just coming home from Lancaster to Carlisle (around 70 miles)
In 2 and a half years ownership mine has only cost me £99 for a Renault oil and filter change and £400 for 2 front Pilot Sport 3 tyres, so if you don't use it a lot the costs are next to nothing. (obviously)
Due imminently is my cars second Cambelt change, as it turns 10 years old next month, even though this Cambelt has only done around 7000 miles in 5 years, I'm changing it to keep the cars history in top notch, and for peace of mind as well, when the engine is out I will fit a clutch, again just as it makes sense to do it now rather than in 2 or 3 years time.
Cambelt and clutch service is approx £1200-£1400 depending on where you take it.
Otherwise, brake discs are your killer from Renault but APEC do a tried and tested alternative and a set of 4 discs can be had for under £200
Body panels are fast becoming unattainable with many not available at all anymore, so any damage at all can pretty much write a Vee off, iirc one side skirt is £1700ish for example