AAA Michigan says gasoline prices jumped 12 cents during the past day to a statewide average of about $4.05 per gallon as Hurricane Isaac made landfall.
The auto club said Wednesday's average for self-serve unleaded fuel was up from Tuesday's average of about $3.93.
Prices already rose ahead of the Labor Day weekend holiday, and AAA Michigan had predicted increases because of possible effects on oil production in the Gulf of Mexico.
Dearborn-based AAA Michigan surveys 2,800 Michigan gas stations daily.
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