Michigan’s average gasoline price rose 28 cents over the past week to $4.31 per gallon, Triple-A Michigan said. The statewide average is 6 cents higher than last month and $1.04 above last year, putting the average cost of a 15-gallon tank at about $65. Ann Arbor and Jackson recorded Michigan’s highest average price at $4.35, while Traverse City was lowest at $4.22. In southwest Michigan, Barry County had the highest price at $4.38 and Van Buren County the lowest at $4.24. Branch County averaged $4.33, Hillsdale County $4.24 and St. Joseph County $4.30. Indiana, where a gas tax holiday is in effect, continued to record the nation’s lowest pump prices at $3.56 per gallon, despite a roughly 20-cent weekly increase. Oil prices were up slightly more than 3% from Sunday to just above $103 per barrel as of the morning report.