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Are you sure the first year wasn't just a prorated ad valorem payment? Looks like Michigan tries to line up registration with your birthday, so you might have only paid for 6 months the first time around. Then the next time it would be for the full 12-month period. This chart indicates that a $90K vehicle would be $416 for ad valorem the second year. Plus whatever other fees they normally charge.

http://www.michigan.gov/documents/Ad_Valorem_Fees_74801_7.pdf