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My TSX had a CD of 0.26
As long as the drag coefficient is not excesssive, say below 0.30, fuel economy shouldn't take too negative a hit. Creating downforce usually creates drag. How much downforce does this type of car need? Not a lot, as long as it is down force, not lift.
In this day and age a passenger vehicle should have low drag. It might not impact city driving as much, but at highway speeds better mileage and reduced noise are attainable/desireable compared to a decade to two ago..
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