This is not an aeromod: plan your trip for daylight so you don't run the lights (1-2mpg some say) and so you get the warm air/road. ALSO two quick mods to consider that I have done and that you could easily reverse as soon as you get to NC--if you wanted to. They are also not aero, but they are easy on most cars: temporarily remove the AC belt and the power steering belt. Many Civics were designed without the PS and had it only as an option. Removing even one of these will be significant.
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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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