Thread: New Diffusers
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Old 08-07-2019, 12:47 PM   #8 (permalink)
freebeard
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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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