AAA Michigan says gasoline prices have dropped about 12 cents during the past week to a statewide average of about $3.25 per gallon.
The auto club says Tuesday the average is about seven cents per gallon less than this time last year.
Of the cities it surveys, AAA Michigan says the cheapest price for self-serve unleaded fuel is in the Flint area, where it's about $3.19 a gallon. The highest average is in the Marquette area at about $3.33 a gallon.
The weekly survey prices reflect an average of all the reporting gas stations in the designated Michigan regions. The Marquette average covers all of the stations across the Upper Peninsula.
Dearborn-based AAA Michigan surveys 2,800 Michigan gas stations daily.