AAA of Michigan says gas prices rose 11 cents last week but declined 2 cents over the weekend. The rise of crude oil pricesĀ is a large factor in the rise, which shows the average price of regular unleaded in Michigan at $2.15 a gallon. Most expensive gas in the state is in the Jackson area at $2.22 a gallon while the cheapest is in the Traverse City Area at $2.07. In our area prices are in the area of $2.11 a gallon.