Yup, and it'll mess with fuel mileage readings...everything. Some cars can have the ECM reprogrammed by the dealer to compensate for a new tire size. Not all, but some. I know the newer Saabs can, and some of the newer GM's can too. For a point of reference on that, my '97 Olds Cutlass Supreme can't be reprogrammed by the dealer for tire size.
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Generally speaking, if you were to get what you really deserve, you might be unpleasantly surprised.
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