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You're better off beginning a coast to a stop sooner to save fuel than simply rolling through.
There's a stop sign nearby where I live, and a slight downhill to it for about 1/3 mile. I'll start coasting from the crest of that hill, adjusting my last speed input based on the traffic I see ahead. A wide gap will develop between me and the person ahead and sometimes traffic will begin to bunch up behind me. By the time I coast to the intersection, the guy in front of me is just accelerating from his stop, and I'm right behind. The perfect coast, having wasted no fuel and having delayed nobody. Often though, there's nobody behind me because prior to the coasting straight is twisting roads, and I don't slow for twists.
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