Just for an example of poor aerodynamics...My 2005 Yamaha 1100 motorcycle gets (measured by me):
28 mpg @ 90 mph
33 mpg @ 70 mph
45 mpg @ 55 mph
54 mpg @ 45 mph
Let's us know that low Cd is good, but motorcycles are not designed for aerodynamic efficiency.
Joggernot
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