I've been in Eco mode the whole time since leaving the dealership 2000 miles ago. City/freeway/road trip, all of it in Eco. It seems that when accelerating on the highway it doesn't matter what mode you're in, it just kicks in what you need. I'd imagine the real difference is starting from a full stop. Eco seems to encourage a slow acceleration in EV mode while Sport gave me the instant torque and started the motor right away.I've been leaving it in Eco mode, no matter what kind of driving. Should I leave it there or normal? Maybe use "Sport" for getting on the freeway?