HiEco button has plenty info in search function buddy.
In short varying opinion but basically cuts power and fuel comsumption when on, however most leave it off until they are on the motorway.
I personally never turn it on.
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I've come to the conclusion that if you have to make the engine 'work' with ECO ON the mpg drops.I drove home with my daughter on the a63 (dual carriageway) last night and at 70 without eco and aircon on cold at fan speed 3 the instant MPG readout showed 49 MPG, I flipped eco on just to see if makes any difference and it read 43 MPG,
I wont touch it again, I can't work out when its best for.
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