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Originally Posted by ChazInMT
UltArc, some good news bad news for you.
Bad news, I don't think that a "Kamm" will do anything other than hurt your cars aerodynamics.
Good news, Your car is pretty dern aerodynamic to begin with, and you don't have to build a Kamm.
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That all seems reasonable, especially with the additional explanation (which I won't repeat here). The more practical place to start would be...
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Do seriously consider a grill block if you have not put one on already.
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..that, and smoothing the airflow under the car. The under-car work may pay dividends not only in gas mileage but also in control and handling improvement. Example: I put an undertray on my Honda Fit and gained ~1MPG, plus the car no longer gets blown around by sidewinds or semis at highway speeds, and it's a lot more fun to toss around offramps too.