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Chris - I just had a look at your fuel log. You are not going to be able to see any difference from the wheel skirts just by watching your tank to tank results. (Not pointing at you specifically - this applies to anybody, really.)
Let's say your skirts are hypothetically good for a 2% boost in FE. Based on your current 90 day average of 28.7 mpg, that means you'll have to be able to detect a 0.55 mpg difference. Ain't gonna happen.
Consider that the average difference between your 3 fill-ups to date is 2.16 mpg and you can see the problem here.
Again, I'm not saying that the skirts aren't worth doing. But the only way to test them thoroughly is either with instrumentation (eg. ScanGauge) in an as-controlled-as-possible A-B-A scenario, or multiple coast-down runs, also controlled as possible.
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