While fuel economy is the reason most people don’t want something with more horsepower than necessary, the difference between engines is the power in and how well that is converted to a force, and how efficiently that force can be turned into velocity.
So you may have an engine with 4 cylinders and can take in power (fuel) and convert that to force x, causing it move at a velocity of y. So your HP would x*y.
But then let’s say you have a 6 cylinder engine. This takes in power(fuel) converting it to 1.5x lbs of force and moves your car 1.33y. So your HP Then is (1.5x)*(1.33y).
Does that answer your question?
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