The best is to learn what your car does yourself, I have found that on my auto when in Drive the transmission shifts itself into Neutral by itself but if in 3-2-1 there is a gear reduction. Neutral coasting engine on should not hurt one bit, i would still be weary on eoc just because that some trannys don't like it.
If you plan on doing pulse and glide it still helps with the engine on just make sure to use your torque converter as much as possible. If you don't it can actually hurt your mpgs.
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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