I've read about the eco-pedal system by Nissan on Paul Tan's blog and I think the e-drive system has the same principle. The e-nenpi system is a MID. Your Honda comes with MID but the output is not as detailed as e-nenpi.
The link I provided does the installation for you. It only works with DBW engines. That means the new Honda City qualifies, all Toyota cars have no problems either.
From the explanation given and my understanding, it controls the throttle valve when you press the accelerator.
In normal mode - it works with the default manufacturer's programming
In eco mode - it ensures that no matter how hard you press the pedal, it will control your acceleration by limiting how much the valve opens hence saving precious fuel
In sports mode - it works in the opposite manner and speeds up your acceleration at the expense of fuel consumption. I assume this also gives you better torque in a faster period of time.
The throttle response controller modifies throttle response behavior based on the mode you select, so improvements are via electronics and software programming. In actuality, there's no HP increase at all
Thanks for the informative inputs again bro... I think I only interested on the "eco mode" that we could take advantage actively from this product to save our precious fuel... minus the "normal mode"(our car already had it), "sport mode" is a cup of coffee - not my cup of tea.
I guess everyone can do eco-drive if they want to, just that to be more aware of our "golden right foot" to control the fuel acceleration... hence if want to go for "eco mode" e-drive could be a more affordable start since it is much cheaper & easy to DIY install.