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There was a guy on here who put them on his Jetta TDi and actually got WORSE mileage from them. I mean they're not really designed for fuel economy. Seeing as they come on the Evo 8 and 9 MR to drive more air towards the wing and create more downforce/aka drag, I don't see how they could be used in a benefical way for FE at all
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(No actual EPA numbers for car just used F/E numbers when i first got it)
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