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  1. How much will a speed 3 or 2.5 liter spoiler lower a skyactiv's gas millage?

    2010-2013 Mazda 3 & Skyactiv Appearance & Interior
    I'm kind of thinking about replacing my stock (2012 skyactiv hatch) spoiler with either a mazdaspeed one or a 2.5 liter one. I was wondering how easy the install would be and whether or not it would cause my gas millage to take a noticeable drop. Thank!