FORT WAYNE, Ind. (WOWO): After weeks of rising costs, gas prices in Fort Wayne have dropped 17 cents/gallon in the last week, averaging $3.72/gallon Sunday. The national average, on the other hand, has gone up 2.6 cents/gallon in the last week, making prices an average of $3.68/gallon. Gasbuddy.com analyst Patrick DeHaan says on the national level, concerns for a possible increase in the federal gas tax, in addition to concerns about Iraq have led to higher prices.