Gasoline costs in the U.S. could fall as much as 30 cents a gallon if lawmakers would repeal a controversial shipping law, industry experts say. The longstanding Jones Act—a section of The Merchant Marine Act of 1920—which requires any ship that carries goods or commodities in U.S. waters be American made, owned, operated and carry a U.S. flag, is being highlighted by one oil CEO as a reason behind the high price of gasoline in the U.S. and particularly in Florida.