my local airport opens the gate for you, and directs you to the pumps. you pay at the pump or pay cash at the office. i understand the concept of road taxes, but here at my airport it's not a big deal i guess. i bought 10 gallons a couple of weeks ago, with my next door neighbor. we're regulars there. he runs it in his truck, and fills it up at the pump. i buy it by the 5 gallon can.