another thing to factor in is the frontal area. A sport motorcycle with a Cd of .5 might have a FA of 6sqft making for a CdA of 3 whereas a sedan with a Cd of .3 might have a FA of 25 sq ft for a CdA of 7.5. this is one reason the sport bike has a higher FE potential. even a small cruiser with a Cd of 1.0 would have similar CdA to a typical car.
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