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Coasting in neutral should be okay. Just don't try to coast with the engine off.
Whether it's worth the trouble to shift and coast will be up to you. When you add some instrumentation (SG or UG, whatevs), monitor injector duty under in-gear decel, see if the duty cycle goes to zero. If it does, the engine is simply being pulled along by the transmission in that circumstance. In that case it's really up to you to decide which is more effective, a fuel-less but somewhat shorter coast, or a longer one at minimal consumption?
With SG or UG you can do short "trip average" mpgs to find which is yielding the greater results. That may require a bit of fiddling and testing.
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Lead or follow. Either is fine.
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