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Here's what I see: you only have 5 fills listed since installing the air dam. One of these you admitted to driving at higher speeds, and another you couldn't get accurate mileage because of the pump. I think you're jumping the gun on declaring the air dam a culprit in lowering your economy. Give it a few months; unless you're doing controlled testing, it's very hard to ascertain the effects of one modification except over a long period of results.
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