The wiper delete, I don't know--although it is worth noting this
is the only exterior difference between the (50mpg highway) Prius and (53mpg) Prius Eco. Removing each mirror takes around .3 ft^2 off the frontal area, probably around .005 off the Cd, and looks a lot cleaner.
Both mirrors off, pizza pan wheel covers, no rear wiper, 1.5" lower, foam grill block, and some underbody paneling is good for Cd .21.