Gasoline prices take a dive – again, down nearly 20 cents per gallon

Average gasoline prices in Washington have fallen 19.8 cents per gallon in the last week, averaging $5.15/g on Oct. 17, according to GasBuddy’s survey of 2,666 stations in Washington. Prices in Washington are 55.7 cents per gallon higher than a month ago and stand $1.38/g higher than a year ago. The national average price of…