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You have to keep in mind that Cd tells you nothing without frontal area. A big truck can have reasonable good Cd. Actual drag is Cd x frontal area. A truck won't have good aero because it will have a huge frontal area. Cd is just a multiplier. Something really tiny could have a bad Cd, but still great aero.
Last edited by jasantal; 06-19-2015 at 04:46 AM..
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