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Originally Posted by seattle
Another analogy, better one.
Let's say you have a skinny fast guy on a 8-speed bike....
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Sorry, but that is not a better analogy. We can use sumo wrestlers, or cyclists, whatever you like, but we can't mix up units of power, speed, and torque. The engineers among us have those definitions down.
The racing cyclist can spin at 7000. He has a certain torque, and so can push a given gear. The heavier cyclist can spin at 5000, but likes a lower cadence. He has a narrower range of efficient cadences. He can push a bigger gear at those lower cadences. But at the end of the day, the racing cyclist can do more work per unit of time. That is all hp is, work over time. A given weight, raised a given distance, in a given time.
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A lower torque vehicle cannot maintain speed under load
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It can if it has more hp. Your statement is true if you eliminate the transmission, or the ability to shift. No frantic hunting for gears required, just drop it one gear or so.
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P.S. This is getting nerdy
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Mechanical engineering. 24 years in the diesel business. We can get a lot nerdier than this 
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