A method and system is disclosed that enables purchasers to purchase gas online for future delivery. The invention requires the purchaser prepay for online purchases or have been extended credit accepted by an oil company. The prepayments are credited to the purchaser's account. For each retail gas delivery, the oil company handles the online gas purchase transaction and reimburses the retail gas station owner for the online purchase. Specifically, the oil company reimburses the retail gas station owner for the taxes and profit on the gas delivered to the purchaser and also replaces the amount of gas delivered. In this way, the retail gas station owner is made whole for each delivery. Oil company also benefits with increased gas sales, increased profit and increased cash flow.Various embodiments of the invention are contemplated. The invention may require a purchaser to select a location of a retail gas station, a selected grade of gas or a combination of both.