I haven't tried a timer with it so can't comment on that, but i do feel it sluggish even under hard acceleration, initially one would feel that there is no difference but eventually one would start feeling it, it isn't a day and night difference but it is there.
As for the CNG type acceleration is mentioned, haven't had a chance to sit in a CNG Civic so don't exactly know the feeling but the acceleration with a new car on ECO ON is quite miserable.
I drive mine with ECO off all the time, feels better.
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