If you can recharge the number, there will be two situations.
First, it is not used for refueling. It will be recharged when the oil price is low, and it will be profitable to sell it when the oil price is high.
Second, when the oil price is low, save more money to avoid the increase in car cost caused by the rising oil price. If this is the purpose, there is no need to store oil at all, and hedging can be achieved by doing more operations in refined oil crude oil futures or spot market. It's just troublesome for individual users.
In short, if the oil card can be charged, all car owners will be pulled into the spot trading platform of refined oil products, but it is hard to say whether it is good or bad, at least it is difficult to supervise. Moreover, the spot market itself exists. If you are optimistic about the rise in oil prices, just buy some. If the oil price really rises, you can make a profit and avoid the increase of oil cost. There is no need to increase an uncontrollable and unregulated market.