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Old 06-14-2017, 12:48 AM   #18 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,092

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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Originally Posted by Natalya View Post
Okay so that chart is suggesting max benefit around 3 then, am I reading it correctly?
Yes. And notice too that anything from 2-4* is really pretty close to the same thing. So a little imprecision will not make a major difference. And, anyway, no matter what we do not have the equipment for precision. And even then, we also have difficulty knowing how a diffuser interacts with other aero mods or features on our cars that make it different than the models on this graphic. So I say, try for three and get close and it will probably be good enough for a benefit. I am no expert. But that's how I understand what gets taught here.

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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