ROANOKE, Va. (WDBJ/GasBuddy Release) – Average gasoline prices in Roanoke are unchanged in the last week, averaging $2.86/g Monday, according to GasBuddy’s survey of 155 stations in Roanoke. Prices in Roanoke are 0.6 cents per gallon lower than a month ago and stand 2.3 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.