In the past week, the average price of a gallon of regular gasoline in Miami fell 5.6 cents per, now averaging $3.10 per gallon as of Sunday. According to the gas prices app and website GasBuddy’s survey of 1,690 stations in Miami, prices in Miami-Dade County are 25 cents per gallon lower than a month ago and 55.1 cents per gallon lower than a year ago.