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Old 01-13-2012, 07:07 PM   #5 (permalink)
4banger
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Join Date: Jan 2012
Location: St. Louis, MO
Posts: 14

ATS - '15 Cadillac ATS Premium
90 day: 27.09 mpg (US)
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Pardon me if i missed anything but according to the calculator the stock tires are .01 inches bigger. So the diameter is the same really. So does that leave me with just the added weight and contact area of a wider tire to worry about? Are those big areas of concern or is the diameter the main area of concern?
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