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A driver refuels a vehicle with unleaded gasoline at a gas station in Los Altos, California, on March 10. Photographer: David Paul Morris/Bloomberg via Getty Images
U.S. average gas prices have hit $4 per gallon nationwide, per AAA.
Why it matters: It's a 35% increase at the pump since the war in Iran began last month, and there's little hope that costs will ease as the Strait of Hormuz remains closed to most ships, straining supplies worldwide.
