Quote:
Originally Posted by CigaR007
Is there a way to roughly calculate or derive the reduction of Cd based on preliminary increase (percentage) in fuel economy, especially in the context of highway cruising at a specific speed ?
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No there isn't.
It's my belief that all Cd figures that people quote for modified cars, that aren't measured in a modern, full-size wind tunnel, are almost certainly wrong. Sometimes, I feel, they are ludicrously in error.