I think eco mode is a marketing angle to make it seem like it has more functions than it really does. Want to sell more? Put 'eco' or 'green; in your description. I have no interest whatsoever in this function and mine will never see it. I mean who buys something to go faster then expect it to save fuel? I recently posted this on the other thread:
And as far as using eco mode on cruise control on the freeway, I don't see how it would improve fuel economy. As it is only a throttle controller that speeds up, or slows down throttle response, and not a mapping device, it seems to me that the only potential benefit to fuel economy would be to slow down acceleration. Once at a specific speed, so much energy (horsepower) is required to move the machine a specific distance. Throttle control is no longer part of the equation at that point. My guess is that once you get up to speed and hold it constant, the Pedal Commander would have no effect whether it's on or off.
The same people who's first question when they see a sports car is "What the MPG on it"