Gas prices continue to drop in Michigan. AAA Michigan's newest survey shows prices have dropped 10-cents in the past week. As of this morning, Michigan's average is at $3.48 per gallon... compared to $3.58 a week ago... and 7-cents cheaper than a year ago. The cheapest gas was found in Lansing-East Lansing area and the highest prices were found in Marquette. The current national gas average is $3.45 per gallon.