ROANOKE, Va. (WDBJ/GasBuddy Release) – Average gasoline prices in Roanoke have risen 1 cent per gallon in the last week, averaging $2.92 per gallon today, according to GasBuddy’s survey of 155 stations in Roanoke. Prices in Roanoke are unchanged versus a month ago and stand 44.2 cents per gallon lower than a year ago. The national average price of diesel has fallen 0.5 cents in the last week and stands at $3.87 per gallon.