AAA Michigan says gasoline prices have fallen about 9 cents during the past week to a statewide average of about $3.87 per gallon.
The auto club says Monday that the drop came after prices rose for four weeks in a row, but the average is up about 15 cents from this time last year.
Of the cities it surveys, AAA Michigan says the cheapest price for self-serve unleaded fuel is in the Grand Rapids, Muskegon and Holland areas, where it's about $3.78 a gallon. The highest average is in the Detroit area at about $3.93 a gallon.
Dearborn-based AAA Michigan surveys 2,800 Michigan gas stations daily.