Your 2011 Civic still has a grill that could take temporary blocking with black foam plumbing pipe insulation well. It would not mark paint, be cheap, easy, and painlessly reversible. You might even like the look, which will be fairly stealthy anyway.
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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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