Michigan gas prices lowest since February, cheapest in Lansing. Michiganders are getting some relief at the pump this week as average prices drop another 13 cents per gallon. LANSING, MI – Gas prices have fallen 25 cents in the past two weeks and now average $3.363 per gallon in the state, according to the most recent AAA Fuel Gauge Report. Last week, prices fell 12 cents. This week it was another 13 cents for a combined 25 cents per gallon.