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Assuming "rough" does not mean 10,000 one inch protruberances from the body panels, the answer is most likely "not much or virtually not at all." Most drag is pressure drag, not body friction, from what I have read. I am no expert, just an interested reader.
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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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