[mpg_numbers_guy]

Mirror delete and wheel skirts, as noted before. Filling in any part of the underbody that isn't completely smooth, covering up that opening in the front of the car beneath the "grille", for aero. Maybe a kammback if not a full boat tail.

I wouldn't go extreme and do something like shave the door handles on a car that expensive just for another 0.01 MPG, but YMMV.

Tire pressure and slow speeds are probably your best bet for improving range with that car.