[ChopStix]

I'm not sure yet. I wanna see what these get me in real world mpg:
Chin Spoiler, Spats, Side Ground Effects, Filled Bumper Pockets, Skirts

Then I'm going to install my pulleys and fan, which should be good for another roughly 3mpg. I'll start a another fuel log for this step as well.

If I get above 30mpg on the highway then I'll stop. Edit: who am I kidding! If I get above 30 I'll will be trying more stuff! Otherwise these are my list of possible mods to try:
Smaller Mirrors, Taller Tires, Filled Radiator Support Holes, Different Style Grill Block, Nose Pan, Belly Pan, Filled Panel Gaps, Kammback, 3 Inch Drop, Carbon Fiber Drive Shaft, Gear Vendors

Some of those obviously will make bigger changes than others. But the biggest gainers also cost the most. And its this fact why these little hobby projects like making ground effects from lawn edging are so interesting.