DETROIT AAA Michigan says gas prices have shot down 22 cents since last week, putting the statewide average at $3.87 a gallon.
The state auto club said Monday that of the cities it surveys, the cheapest price for self-serve regular fuel is in the Flint area, where a gallon costs $3.79. The highest average can be found in the Marquette area at $4.11.
The statewide average for biodiesel is $4.69 and $3.40 for ethanol.
AAA surveys 2,800 Michigan gas stations daily.