I have owned my RCF for a year now and came from a really nice 2012 ISF. I think Rob RCF above in his post summed it all up very well.
I was a little unsure I had made the right decision at first in going to an RCF, it looked really good, but after a month or so I wasn't sure I would keep it long as it felt a bit sluggish at times, and not that responsive when really needed, it also felt a very big and wide car. I felt my ISF was much more instant, responsive and easier to driver fast and why wasn't the RCF the same?? Driving the RCF gently or commuting as a daily is fine and it feels a very good quality car for this and a nice refined place to be, but seems a bit wasted on this kind of driving. I hadn't really gelled with it on the more open road or when driving it much quicker, that took probably 3 or 4 months or so to gel with. Now I think the RCF is not sluggish at all and is very responsive, and a far more lively car than my ISF was, it is definitely quicker! Now I have gelled with the RCF I know exactly what gear to be in and what mode to use and how to drive it when pushing it. You do need to really drive it properly to get the best out of it and not be frightened to really rev it and use the paddles. The autobox gears selection and modes do take a little while to fully master how to drive the car quickly to get the best out of it for your situation. If you drive in full auto in normal mode and don't use the paddles you do get a slight lag in the autobox or a small hesitation in some situations when driving gently and then want to suddenly accelerate hard, but if you use sport or sport plus and do some manual shifts on the paddles the thing comes alive and it becomes a very responsive and quick car, actually a lot quicker that you realise. The car hides the speed very well with its refinement on good road surfaces. Poor road surfaces can give a stiff ride but still perfectly acceptable. In fact if you drive it a bit quicker it rides better on rough roads I think.
So the RCF drives very nicely and smooth if you want to take it easy, or turns into V8 monster when needed, it has two personalities for sure!
I agree on the tank range, i get 240 to 280 miles on a tank average with mostly 20 mile runs, and I have got 330 miles from a tank on a long run, but I dont drive that carefully with the throttle, I think I could do better than that if I really tried.
Now I have got used to the RCF I think it is brilliant and a fantastic GT car, totally awesome on longer journeys. Feels like it could go for ever, fast, comfy and a really nice place. You don't fully appreciate how good it is until you really get used to it and do some longer journeys in it. It is really quick when you know how to get the best out of it and you begin to really open it up with full confidence. Over all I am very very pleased with it and intended to keep it for a long time. There is nothing else quite like it. The interior, looks, very good reliable engine, rarity, driving experience, and character of the car makes it a unique package and the fuel economy is very good for what it is. I would definitely recommend if you can live with a 2 door car and 250 miles from a tank.