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There is a method to the grocery rule. Part of it is to make motorcycles more useful to more people. The practical reasons being cited for not owning a motorcycle include no cargo capacity, no weather protection, and no rider safety. Streamlined bodies can address these problems and retain the essential riding experience. The goal is to challenge cars and buses in passenger-miles per gallon of fuel. The target is 500+ passenger-miles per gallon. Motorcycles are slowly catching up. The question we are looking at now is whether a larger engine run at low rpm is more efficient than a small engine running at higher rpm to get the same power and mass rate of flow.
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