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In my 4 cyl GMC if I coast in neutral with the engine running it is burning 1.2 ounces of gasoline per minute. With the engine off it is of course not burning any.
So it would take less than 2 hours of coasting in neutral, with engine running, to burn a gallon of fuel.
If I coast down hill, in gear, such that the engine is braking the vehicle, it burns no fuel. But if I coast down the same hill in neutral, using the brakes to slow the vehicle, it is again burning 1.2 ounces of gasoline per minute. So it is much better to have it in gear than in neutral while coasting down hill, if I need to slow the vehicle.
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