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Old 08-09-2019, 02:15 PM   #4 (permalink)
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Join Date: May 2011
Location: Czechoslovakia (sort of), Europe
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Dáčenka - '10 Dacia / Renault Logan MCV 1.5 dCi (X90 k9k)
90 day: 47.08 mpg (US)
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I am pretty sure you found this:

There is written both mods are worth about 3% MPG. As you drive Civic, which is very clean car aerodynamically, there is not much to be done. go for smooth covers, than grille block. both can be made stealth and are not too demanding on fabrication skills.

Last edited by seifrob; 08-09-2019 at 03:09 PM..
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