My driving experience is that the "seat of the pants" feel regarding aerodynamic alterations/changes can be felt at 35 mph, and maybe as low as 30 mph.
If you are on a bicycle you can feel changes in aerodynamics at much lower speeds just by leaning forward or sitting upright.
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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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