NOTE: this is 2005 info; the ceiling for dealer fees in MI may be higher now
"Effective Jan. 1, 2005, the documentary preparation fee maximum was adjusted to $170, as allowed by Section 13(2)(a) of the Motor Vehicle Sales Finance Act. The fee may not exceed 5 percent of the cash price of the motor vehicle or
$170, whichever is less. If you have questions about documentary preparation fees, please contact the Department of Labor and Economic Growth, Office of Financial and Insurance Services at (877) 999-6442."
Another case where the state government has capped these fees in an effort to protect consumers. Go Michigan!