It doesn't. Here in the U.S., most states only have you pay tax once, when you first buy the car/plates. Then all you have is a plate renewal cost each year after that. Some states go by the type of vehicle when calculating the plate fees, other states go by the value of the vehicle when it was new.
None of them really care about what size the engine is, or its displacement. And I would about bet that most of the erroneous entries are from U.S. vehicle owners here.
ghammerly 
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