The latest survey from AAA Michigan pegs the average price for a gallon of gasoline in the state at $3.70. That is down just over 2-cents from last week and down 25-cents from one year ago. Some of the cheapest gas pumped in the latest survey by the auto club was in Lansing where prices were as low as $3.63 a gallon. AAA surveys 2,800 Michigan gas stations daily.