Not any aero mod yet. I want to change the rear shock first. I don't want to take out the mod again when I change it. I am thinking using window screen for both belly pan and grille block.
I remembered you told me the moon racing disc didn't give you much help in mpg. but, your grille gives you 2mpg. I don't notice the huge difference like yours. my mid grille block gives me 1mpg or less. I may block the lower grille later. Still, the greatest improvement is from my right foot.
By the way, have you changed motor oil to 5W30? @ 65mph, I can run 38mpg. I feel the difference between 5W30 and 10W30. My xB is stick shift and running a lot of freeway.... If you change synthetic transmission oil and slow down to 60mph, you may get 40mpg. This is how I got there.
My scangauge needs few tanks to calibrate. It is not accurate at all. I don't trust the mpg number now, but tps gives me some guideline how my foot is doing.