Does anyone know whether the A/C is OFF or ON when the ECO is ON (display shows ECO) and the A/C is OFF? Is it better to have the ECO mode OFF or ON for FE when the A/C is OFF??

I don't know if ECO will help during heating season, but it won't get you worse mileage and possibly better so I leave ECO on all the time.

On a side note leaving it in AUTO mode will sometimes have the A/C light on when I wouldn't expect it. I'm guessing the cabin has heated up during cool sunny days so the A/C wants to turn on. I'm careful about keeping the A/C off.