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Clearly, the biggest impact on freeway MPG is speed. So the easiest way to improve is by slowing down.
However, if that option is "off the table", then the aero improvements will be "it". Work on the grille block; the more complete, the better, but watch your engine temp. I think a full belly pan might be more effective than air dam & side skirts. Others have made great improvements by kamm backs and boattails.
Rear fender skirts seem to work better on some cars than others. Unless someone else here has firsthand knowledge about your particular model, you might want to experiment.
Cutting the drag from your outside mirrors can help too, either by eliminating the mirror(s) you can, or replacing them with much smaller ones.
Putting even more air in your tires could help a bit, too...
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