Average retail gasoline prices in Indiana have fallen almost 12-cents per gallon in the past week according to GasBuddy's daily survey of 3,271 gas outlets in Indiana. The average price for a gallon of unleaded is now $3.50, which compares with the national average of $3.61/g according to www.GasBuddy.com. Prices yesterday were 23-cents per gallon lower than the same day one year ago and 35-cents per gallon lower than a month ago.