Quote:
Originally Posted by j-c-c
Doesn't seem to me that a typical rear spoiler often reduces drag, leading to better mpg.
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This is a good example of the non-intuitive nature of aerodynamics, because appropriately-sized spoilers typically reduce lift and drag (cf.
Aerodynamics of Road Vehicles pp. 191-195). You can see examples of this on production cars such as the Civic hybrid, where a small spoiler was fitted to the trunk edge:
2005 Civic sedan, non-hybrid:
2005 Civic sedan, hybrid:
2008 Civic sedan, non-hybrid:
2008 Civic sedan, hybrid:
