Average gasoline prices in Oregon have risen 1.5 cents per gallon in the last week, averaging $3.50/g Monday, according to GasBuddy’s survey of 1,307 stations in Oregon. Prices in Oregon are 8.6 cents per gallon higher than a month ago and stand 6.9 cents per gallon lower than a year ago. The national average price of diesel has decreased 2.4 cents in the last week and stands at $3.626 per gallon…