 844 now here on WDEL. The tight-range yo-yo of gas prices this summer continued last week with a 9% drop in the average cost of a gallon of gas, according to the weekly survey by GasBuddy of local service stations. The price of the pump, the average, $3.42 a gallon, two cents lower than a month ago, a dime lower than last year. GasBuddy says weaker-than-expected demand, rising supplies,