The average price of self-serve regular gasoline jumped 11.5 cents per gallon during the past week, AAA Michigan said Monday.
The statewide average of $2.30 per gallon is 29.5 cents higher than a year ago.
The Flint and Grand Rapids areas have the most expensive gasoline of Michigan's metropolitan areas at $2.32 per gallon, the auto club said.
In the Detroit area, the average increased 9.4 cents per gallon to $2.27.
Dearborn-based AAA Michigan surveys 2,800 gas stations daily for its report.
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