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The main point Craig stresses is that less air drag means less power is needed which means less fuel burned. The compression ratio is a key to thermodynamic engine efficiency. Mass rate of flow of air/fuel mixture is a function of displacement and rpm. The light high rpm engines are favored for racing and may have a slight advantage with less overall weight. A long stroke, lower rpm engine may burn less fuel and have a broader torque band for street riding. A well designed shell will reduce drag, provide ample cargo capacity, and offer more crash protection. The bulkheads on my tail box are 9mm aluminum honeycomb to protect the back.
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