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It depends on the car. The entire undercarriage is maybe 25% of the total. The delta in overall Cd is twice the delta in fuel consumption IIRC. IOW 10% better drag is 5% better mileage (kilometerage?).
Other areas that might see improvement could include rear-end lift, but it's going to depend on the vehicle.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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