Gas prices in Oregon are down nearly 4-cents a gallon to $3.89. Marie Dodds, with Triple-A says prices should continue to fall. Diesel declined a penny over the last week to $4.27. Alaska still has the highest price for a gallon of gas; Washington State is 9th, and Oregon's price is 11th highest. Locally, Bend's gas prices are around $3.89 this week.