I did some suspension work when I first bought it; SPT lowering springs, Whiteline anti-sway bars front and rear, strut tower braces, various bushings.
Then I got a Scangauge, and now I'm hooked on trying to get crazy mileage.
Remove rear seat.
Aero mods; primarily mirrors, belly pan, and grill blocks.
Lightweight and narrow rims, LRR tires.
Other weight reduction as I can do it.