Eco on/off is a characteristic which can be handled in meter...
In ECO ON, car utilize minimum fuel, there is green light on in the meter, you have to press the pedal lightly, if u press the pedal aggressively, the green light turns off and the fuel consumption increases automatically... Pick of the car dies in this mode...
IN ECO OFF... There is no such scene, pick is good, fuel consumption is according to type of driving... I usually drive with Eco Off, there is hardly difference of 1 km/L from Eco On...