I own a hybrid and I found myself going to ceramic brakes and slotted cross drilled rotors.
One good dump of the mechanical brakes and rebraking has a reduced effect. I have to make several 70-0 stops in my commute and by time I got to the 3rd one in a row my brakes were fading out.
Do these wheel covers really do that much in terms of mpg? Im tempted to try the mustang brake rotor cooling thing that improves mpg by providing a cushion of air over the wheel.