1) 30/32 locally and 36/38 on a decent run. I did have the trip show 40.7 on a VERY gentle touring run once. Depends on so many variables (like with any car).
2) Mines been generally reliable. But as someone else commented, the auto wipers do sometimes seem to have a mind of their own. It either works really well on auto, or it's pants. Would just rather have an adjustable intermittent wipe myself. My gearbox lost all even numbered gears once, but an updated gearbox map seemed to sort it (been fine since). Only did this once (once was enough!) and it appears to be a VERY rare issue, could only find one other complaint on the Internet about this with an EDC box (not on a Clio though). I also think the headlights are pants, even with upgraded bulbs. But then again, I did come from a car with HIDs.
3) Got to be LY. Great colour and unique to the RS.
4) As others have commented... normal auto is fine but not that sharp (does the job though). But if actually "driving" the car, you want to be in manual (sport or race) and it's fine then (IMPO).
BUT... as usual. It's really a car (like any I suppose) that you want to get a GOOD test drive in, the longer the better and then decide if it's the car for you.
If you get the chance, then try and pick one up with the RS monitor (I like toys myself and wish I had one). Also the rear parking sensors (and/or parking camera) are also worth getting if you can. Small high back window does not give great rearward visibility. Or I could just be rubbish at reverse parking I suppose :lol2:
PS. Also worth mentioning, that the latest euro 6 models come with an extra 20Nm of torque (and the dreaded stop/start).