Generalizations can be dangerous, perhaps citing for example two pick up trucks each fitted with bed aero-caps against each other would be one such example.
Assuming the beds were fleet style and not side-step or sport-step and the frontal areas and ground clearances the same, then a comparison of the front cabs/headlights/fenders could be taken into account.
Real life side winds may also be an interesting factor verses traditional Cd and frontal areas alone.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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