cD on a motorcycle is terrible. There's far less engine, transmission, and electronic fuel-saving technology. There's also far less government requirements and market demands driving FE improvements. Additionally, could drive chains be very lossy?
When you consider those things, 40km/l for a 500 pound bike with a 150 pound rider, vs. 17km/l for a 2000 pound car with a 150 pound driver vs. 8km/l for a 5000 pound truck doesn't really sound that bad
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