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It is not the materials you are using but the effects from aerodynamic engineering that you are trying to emulate... that's what makes what we do both outlier and wicked cool: when it works we can show it with discipline. Don't look for other forums. Get the science. There is a noted book, often cited here by areohead by Hucho on the aerodynamics of road vehicles. Big authoritative summary of the sceince. Get a copy from your library. I did. Excellent. BIG book. Alternately, show them how the OEMs do lots of the same things. Do a google image search for "2013 chevy malibu aerodynamics" ... the image of the red Malibu with the various aero benefits of small changes fits with a lot of what is called "aerodynamic optimization," which is really what we are imitating a lot of the time.
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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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