I remember the "coasting" feature being discussed before at length, some while ago. From what I remember, there is a section at the bottom of the main dash that shows when it is coasting. At that time many people who thought they had it where getting confused with another feature. Its a long time ago, at least 3 years ago it was discussed and it was an interesting thread which I learnt a lot from.
Extract from the manual:
found the discussion, it was actually in the B47 MPG thread around pages 5,6,7. One of the key comments is copied below.
The system helps to save fuel.
To do this, the engine is automatically disconnected from the gearbox in selector lever position D under certain circumstances. The vehicle continues to roll in idle to reduce consumption. Selector lever position D remains engaged.
This vehicle condition is called coasting.
As soon as the brake or accelerator pedal is depressed, the engine is automatically connected again.
It is selectable in as far as you have to tick a box under Eco Pro Settings in the iDrive.
It does feel distinctly different in that it tends to run away with itself and you also notice when drive reengages.
It only works in Eco Pro and when not using Cruise Control.
It is clear when it is coasting from my Multi Function Display as follows:
Display in the instrument display
Sorry can't attach this time or obtain it from my Manual on My BMW - but see original post.
The marking in the efficiency display has a blue background and is at zero.
The coasting point display is illuminated at zero when coasting.
I don't know what it shows if you only have the standard Black Panel Display - sorry.
Hope this helps.