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By coasting, I assume you mean what we call free wheeling over here. It is bad practice and if your vehicle is fuel injected (from its age, I guess that it is), it does not save any fuel. Take your foot off the throttle and you use no fuel with FI; carbs are another matter of course. Coast in neutral or with dissengaged clutch and your engine will be using fuel to tick over. That could be at a rate of a litre per hour for you car. It is worth measuring engine tick over consumption so that you know where some of youe fuyel is going.
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