If you find yourself accelerating to a speed that is too high on the down side of a hill I would first try to crest the hill at a lower speed (using less energy to get up and saving gas). If this is not possible, I would then put the car in gear to reduce or hold at or under your max speed. The reason I would recommend this is because while you are coasting in gear, you are using no fuel.
Does that answer your questions? I didn't quite understand your last part about DWL.
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