AAA Michigan says gas prices statewide have fallen about 32 cents in the past week.
The Dearborn-based auto club says the decline can be partly contributed to last week's restart of a large distillation unit at an Indiana oil refinery. The unit had shut down in early August for unscheduled repair work, and gas prices rose sharply.
According to AAA Michigan, the average price for self-serve regular unleaded gasoline was about $2.52 per gallon on Sunday. That's about $1.08 less at the same time a year ago.
AAA Michigan surveys daily fuel prices at 2,800 gas stations across the state. The lowest average price was about $2.41 per gallon in the Marquette area, while the highest average was about $2.61 in the Lansing/East Lansing area.