Curious why you all switch to Normal (or Sport) on the highway. I've covered probably 3k at 70MPH and, if I need more, I just press the accelerator a little harder. If all the ECO mode does is change the sensitivity of the accelerator, then pressing 1" in Eco rather than 1/2" in Normal should give you the same result. This thing is a rocket compared to my Prius v.
That tip about turning off lane centering and power steering assist is something I hadn't thought of. Thanks.
Besides throttle modulation, the steering respond/stiffness and others might change a bit as well. It's totally my personal preference - thinking if ECO won't save when going 70+ mph, why not switching it to sport mode and I can at least enjoy the redness on my cluster a bit......feeling 1+ hp right there ;-)I drive sport all the time. It's the best if you have control over your foot. I get same mpg. I do find I can stay in ev mode only more easily when I am in sport mode.