i havent got an FD yet but id probably stick with V-Power or RON95....standard unleaded should give you -1L/100km over cheapy fuels and E10, premium should give you another -1L/100km.

I worked it out and its more economical to buy normal RON95

At the moment in my ED3: E10 + caltex(safeway) petrol = 9-10L/100km, shell unleaded 95 = 8-8.5L/100km, V-Power 7-8L/100km? (not sure havent tried it but that would be my estimate)