ECON (is mine the only Honda that has an "N" on the button?) mode does several things. I use it by default in my Accord hybrid because it slows the response in cruise control. In NORMAL or SPORT, in any type of close traffic it adjusts speed too abruptly. My wife keeps the 1.5T CR-V in ECON because I can't convince her that the performance sacrifice is much more than any mileage gain.Frankly, ECO mode in Honda's sucks... because in modern Hondas it deliberately cripples performance for a benefit of a modest improvement in fuel economy (for a light footed driver). This is true for the ICE version as well as the iMMD hybrid drive. In my limited experience with ECO mode in my ICE CRV... a heavy footed driver gets penalized by ECO mode in terms of fuel economy.. so might as well just stick with setting the CVT to D and just drive.
And some of you may have seen this before, but I once did a short (10.2 mile) but highly controlled test that compared the three modes in the Accord. The main point was actually to show how the button-pushing strategy he used hurt mileage, but I extended the test to cover the three modes.
- ECON: 55.0 mpg, w hands off the buttons
- NORMAL: 54.1 mpg, w hands off the buttons
- SPORT: 48.9 mpg, aggressive button pushing