With gas at $1.85.9 cents per gallon, it will be a happy new year in Bluffton. At these prices is costs only $27.90 to fill a 15-gallon tank. When gas cost $3.85 the cost to fill a 15-gallon tank totaled $57.75. The Icon asks out-of-town viewers to update us on the cost of a gallon per gas where you live.