For the most part, unless you live in an extremely flat area, I would turn ECON off only when cruising on the highway. Small hill variations seem to keep your speed fluctuating when ECON is on, but not when ECON is off.
Since you won't be constantly accelerating uphills like you would with ECON on, you get slightly better mileage with ECON off on the highway.
I believe at least.
My wife does 80% of the driving, I get my fix on the weekends...
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