LANSING, Mich (WLMI) The price at the pump is up about 11-cents per gallon in Michigan over the past week. Triple-A says the statewide average is now $3.52 a gallon—that’s about 31-cents higher than a year ago. The cheapest gas in the state can be found in Detroit at $3.49. The priciest is in Marquette, where it’s $3.58.