This happened to me three days ago in Cleveland, OH:
I went in to prepay for gas at a gas station. The gas price happened to be exactly $3.00. I asked for 10 gallons. The clerk got her calculator out, punched away at it for a good two minutes, then said: "That'll be $22.80 please." I just paid, got out and put the 7.6 gallons in the car.