AAA Michigan says gasoline prices have dropped about 2 cents a gallon in the last week.
The auto club says the average price per gallon of self-serve regular unleaded gasoline was $3.10 on Sunday. That's about 22 cents less than it was one year ago.
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Dearborn-based AAA Michigan surveys fuel costs at 2,800 Michigan gas stations daily. It says the cheapest price was $3.06 a gallon in the Detroit area. The most expensive price was about $3.19 a gallon in the Marquette area.