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Wait. "Cd" is coefficient of drag. "Frontal area" is the total area of the car as "seen" by the wind. "CdA" is the product of the coefficient of drag times the frontal area. That's correct, right?
A mod can increase frontal area and yet decrease total drag (CdA) if it reduces the coefficient of drag. An example is a really large and low airdam, as in this thread.
(EPA calculates frontal area only to include the area minus the wheels and mirrors, but including any protruding suspension and such.)
This is correct, yes?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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