Filling up your tank is pricey, and the total cost is more than just the price of gas alone. Every time you fill up, a federal gas tax and a state tax gets tacked on to each gallon of gas you put into your car.With the price of gas skyrocketing of late, in large part because of the war Donald Trump started with Iran, the president has floated the idea of suspending the federal gas tax altogether. But how much would that really save consumers?

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