Though U.S. refineries are making a blend of gasoline that’s cheaper to produce, maintenance issues are keeping consumer prices elevated, AAA said. The motor club lists a national average of $2.29 per gallon for Tuesday, relatively unchanged from one week ago. The retail price for a gallon of regular unleaded gasoline is down 20 cents, or 8 percent, from one month ago. U.S. refineries on Sept. 16 started producing a winter blend of gasoline, which is cheaper to produce because fewer environmental safety measures are necessary during cooler months. This should push retail prices lower. “Unlike previous years, refinery maintenance season this autumn is expected to be heavier than usual due to refineries operating at higher than normal rates for longer periods over […]