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DWL = Drive With Load, which translates to "keep the throttle opening as constant as possible and let the speed vary." However, wind resistance goes up as the square of speed, so for the least energy use at a given average speed, you keep the speed constant. Of course, if you know you'll have to brake on the way down a hill if you top it at your best speed, it pays to back off a bit so you won't have to brake as much.
A rowboat has a slight variation in speed as the rower moves back and forth, and the IOC banned the sliding rigger that allows a more constant speed.
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