The national average retail price for gasoline in the United States fell below $4 a gallon on Sunday for the first time since mid-April, as hopes for a possible end to a months-long conflict between Washington and Tehran improve market sentiment.
GasBuddy data showed the average at $3.997 a gallon on Sunday, up 90.8 cents from a year earlier. The American Automobile Association reported a national average of $4.065 on Monday.





