I wouldn't do EOffC in an automatic tranny. That will damage the transmission and put wear on the starter. In the owners manual for my Civic, it says that the transmission can only go 50 miles while being towed in N with engine off. So if you EOC 1 mile per commute trip, then you only have 25 days before the transmission starts having problems, according to the Manual.
I EOnC with my Civic at 10-45 MPH because it can coast really far at those speeds, and that is most of my commute to school (going home I take the freeway because there is no traffic and believe I get better mileage going that way).
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