Average gasoline prices in Eugene are unchanged in the last week, averaging $3.28/g Monday, according to GasBuddy’s survey of 78 stations in Eugene. Prices in Eugene are 2.5 cents per gallon lower than a month ago and stand 6.3 cents per gallon lower than a year ago. The national average price of diesel has increased 1.5 cents in the last week and stands at $3.488 per gallon.