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I live in the ATL suburbs as well and most of my driving is between 35mph and 60mph. So far I have gotten the solid "moon disk" wheel caps (more for looks, but might help a little bit on the highway, but no tests yet) and I have planned mods to do wheel skirts, read VGs and grill blocks before I head down to Disney World around mid March for spring break.
I would have to agree with Lazarus though, most of my gains in mpg were from changing driving habits. A lot of the driving in the area that you and I live in is stop and go, however, so I have noticed substantial gains in mpg from putting a limit on how much acceleration from a light I give myself, getting into neutral whenever I have a hill to coast down (and in GA there seem to be many of those). I also, recently, have started turning off the car at lights and often while coasting (EOC) instead of just neutral and I should have the test data for that in the next week or two, whenever I need to fill up again.
If you take a look at the millage on my Camry, I went from 22mpg to 28mpg this last tank just by coasting more and limiting my acceleration from lights. I expect to see between 30 - 35mpg after I start to EOC more.
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