Gas prices in Michigan are up again. According to the latest survey from AAA, drivers in Michigan are now paying an average of $3.47 per gallon of regular unleaded. That price is 10 cents more than last week, 37 cents more than this time last month, and 25 cents more than this time last year. The highest gas price averages are in Metro Detroit at $3.50 and in Ann Arbor at $3.48 a gallon. The lowest prices are in Benton Harbor at $3.35 and Traverse City at $3.37 a gallon. Locally, Port Huron area pumps are around $3.44 a gallon.