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Old 05-12-2018, 11:05 AM   #159 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Quote:
Originally Posted by mpg_numbers_guy View Post
... So something like that could possibly work, but only if I had a belly pan and rear diffuser installed to stop the parachuting?
Toyota seems to think it can work when a diffuser is incorporated into it, and they have some of the best aero engineers in the world, I am sure. But you do not want a race diffuser, designed for reduce lift. That will also induce drag. You want a design angle that is quite a bit gentler. On my Civic coupe that meant 4* rise from behind the rear axle to the rear bumper cover. I cannot prove it works. I just know the science says it probably does, if I executed it well enough.
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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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