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Old 07-11-2018, 02:11 AM   #2 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

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 svt98t View Post
.... I'm starting to think that the forward angle of the chin spoiler is actually killing my mileage and not helping as much as it should. ....
From my EM eye, I see two things that maybe make this less than ideal, but I do not think you can know for sure on the basis of the experience you describe.

First, it leaves the spinning forward face of the front tires in the airstream and second it may be too far back from the front of the bumper. Compare how your car and a new Fusion are shaped at the chin.

The Fusion has a bluff face that extends far below the front wheel hub center. On your Vic the OEM design has a much higher stagnation point--above the hub center. I think you want to lower your stagnation point and move airflow around the tires more than currently.
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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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