Gas prices up eight cents in Michigan since last week, up 13 cents in metro Detroit

Gas prices in Michigan increased eight cents since last week, averaging $4.23 per gallon, while metro Detroit saw a 13-cent rise to $4.22. Prices are up 98 cents from this time last year, with Ann Arbor, Benton Harbor, and Lansing reporting the highest averages, and Traverse City, Marquette, and Grand Rapids the lowest.