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engine braking, or coasting in gear, or lifting your foot off the gas, is just like "braking" w/o the use of the brake pedal. in neutral, you somehow conserve your momentum, that's why you reach farther in contrast to coasting in gear. the only force that is allowing you to decelerate in neutral is friction, gravity, road curvature, and the air. this is assuming that you are the only vehicle on the road.
some good flat pavements even when curved actually prolong the effect of coasting in neutral. based on my observation, wide curving roads that are banked actually prolong the coast when entered properly (right speed).
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