Michigan’s average gasoline price rose 62 cents from the previous week to $4.93 per gallon, according to Triple-A Michigan, reaching a new high for 2026. The average is also 72 cents higher than last month and $1.75 above last year’s level. Filling a 15-gallon tank costs about $74, up $23 from last year’s high set in August. Ann Arbor has Michigan’s highest average price at $4.97 per gallon, while Marquette has the lowest at $4.79. In southwest Michigan, prices range from $4.89 in Calhoun County to $4.99 in Barry County. Branch County prices were $4.92 per gallon, while Hillsdale and Calhoun counties each averaged $4.89 and St. Joseph County averaged $4.95. Across the state line, Indiana’s average stood at $4.01 per gallon, the first time prices there have reached that level since late spring after the governor declared a gas tax holiday in May. Steuben County’s average was $3.94. Dr. Jason Miller, a Michigan State University supply chain management professor, said oil prices remain around $100 a barrel. The national average was $4.47 per gallon.