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Furthermore, I've also experimented with a WAI and, while I do feel it has minor positive effects, I don't know if they're significant. I keep mine on because I think it helps. I might take it off again soon to compare, however. In contrast, the effects when I started blocking my radiator were immediately visible, so I'd recommend that first. Warming your engine is several times more conducive to efficiency than warming your intake air.
From the last two weeks, the three best and worst trip mpgs I've recorded are provided below alongside engine temps and intake temps to show what I mean. As you can see, there's a near linear relationship between engine temps and mpg, but a low correlation between intake temps and mpg.
39.7 -> 185, 51
39.1 -> 190, 52
38.6 -> 181, 63
22.8 -> 150, 50
25.6 ->172, 50
26.2 -> 171, 50
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