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Gas prices are hitting their highest mark in history. The national average for a gallon of gas is sitting at $4.25. That’s a new record high, beating the previous high of $4.11 per gallon, which was set in July 2008. So what does that mean for you? Well, just one tank of gas will cost you $63.75 on average to fill, assuming a 15-gallon tank and a car that uses regular unleaded gasoline.