So I put my duct taped wheel covers on, 4-9km/hr winds today...and yielded yet another 4.8L/100km on the same 63km stretch. I was a little disappointed actually, I thought the wheel covers would do more..or something measurable. I might be reaching the upper limits of what this car can do without more drastic measures.
About the only thing left to try is the belly pan, but I have to source a large piece of chloroplast first...
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
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