An underbody pan might already help you, but would you be likely to get a newer, rounded-body Saveiro instead of the square-body one? As its design is already flushier, the aerodynamic improvement is noticeable, and there is also more room for further improvements. I already saw some drag Saveiros with acrylic windows attached closely to the door arches in order to not leave that gap between the glass and the door panel.
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