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At low speeds, the efficiency of rockets is abysmal because of low Froude numbers. The rocket is pushing on stuff that is running away, so it is in a higher "gear" than an elevator on the same run, but getting nothing for the "reduced torque."
However, I also disagree with DWL, as long as one stays away from throttle openings that go to a rich mixture for power, abandoning economy. Bike racers work hard going uphill, but rest when they would only be fighting the air.
Perhaps someone with a scan gauge will do a comparison between total consumption going over a hill using DWL vs constant speed to the same average speed.
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