Average prices of gas in Washington $3.64 (AP) - The AAA auto club reports the average price of a gallon of gasoline in Washington is $3.64. That's up 11 cents in a week, 17 cents in a month and 29 cents in a year. It's 7 cents higher than the national average. Some metro prices from Monday's AAA survey: Bellingham $3.77, Bremerton $3.69, Seattle-Bellevue-Everett $3.73, Tacoma $3.72, Olympia $3.74, Vancouver $3.70, Yakima $3.51, Tri-Cities $3.39, and Spokane $3.27.