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Most engines are putting out more power then needed at cruising speed tho, so say your car requires that 8kw/10hp to maintain speed, the engine is most likely putting out closer to 12kw/15hp, so with a lean burn engine you keep the same engine speed but cut out some of the fuel so it run leaner, you get a drop in power but it's a low load condition so you don't need that power.
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This can't be right... If your engine is creating more hp than the car needs for the speed it has to put the difference into acceleration. If not where does the extra work go?