FORT WAYNE, Ind. (WOWO): Gas prices have fallen nationally, but that's not the case for Fort Wayne. Average retail gasoline prices in the Summit City have risen 11.1 cents per gallon in the past week. Patrick DeHaan with GasBuddy.com says the hike is likely due to refinery issues and planned maintenance, but as the driving season concludes, prices are likely to drop- most significantly in late September through the holidays.