Kleenwheels do a great job of keeping the wheels clean...at the expense of increased brake temperatures which can lead to premature wear. From an aerodynamic standpoint, I don't think they'd help as much as smooth wheel covers.
SL8Brick
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1999 Audi A6 Avant Quattro - 2.8ltr 30v V6/Automatic - 149k miles
1993 Volvo 240 Wagon - 2.3ltr SOHC/Automatic - 323k miles
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