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Do you have a scangauge? That would be the best way to test it. I think it would be more efficient to coast to a stop in neutral. Only pressing the gas when needed. If the road goes from 50-20 slow down by coasting in neutral and come to a stop at the line. I would think this is the best way. If you are sitting at a red light you should be in neutral with the engine off. Even with it on it is better to have it in neutral and idle. A obd2 computer like a scangauge ultragauge or torque. Would be able to show you.
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