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    Gas Milage Change on sizing up to 225/45/18?

    I'm looking at putting Falken 452 or Sumitomo HTR Z III on my stock wheels.(both 225/45/18) Does anybody know how much change this would cause in my gas milage? My Speed is stock except for a Cobb SRI. If its gonna be a big change or there are other reasons to not size up, then I'm guessing I...
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