Mine is actually hanging off at about a 90 degree angle to the flow of air, so its not really in the air path. I was thinking it probably wouldn't do much for MPG at first but then I starting thinking about it creating drag on the input of air then my train of thought got more technical about creating vortex drag etc etc...but that's my problem sometimes, the easiest solution gets covered up by over thinking...guess that's why I'm an engineer...LOL
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