Quote:
Originally Posted by MetroMPG
It's important to be sure all other elements of the sedan & hatch are identical (eg. engine size/power, tire size, ride height), since these things will affect aero/Cd.
Sedans may not get the tidy flow separation that hatches do, but modern sedans aren't terrible in that respect. If you look at smoke tests in the wind tunnel, you'll see the trailing wake (filled with smoke) makes up a much smaller cross section than the hatch's wake.
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I believe that the Hyundai Sonata hybrid sedan has a lower Cd than the Prius.