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With my GMC 2.2l fuel injected coasting in neutral uses fuel whereas coasting in gear turns the injectors off and uses no fuel. This is true if the coasting speed (engine RPM) is fast enough.
I live in a very hilly area. going down many of the hills requires braking, engine braking or otherwise. If I were to put it in N going down the hills it will use fuel at the rate of engine idling, and I have to apply the brakes to slow down. But if I leave it in gear it uses no fuel going down the hill and also serves to slow the vehicle.
In my vehicle coasting in N only helps FE if the engine is OFF, and even then it only makes sense if I do not want the engine brake affect, which I often need where I drive.
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