The average price for a gallon of gasoline in the United States has moved closer to $4, jumping more than 19 cents since mid-March to a level less than 10 percent below its all-time high, according to a survey . The survey suggests the national average price of self-serve, regular unleaded gas was $3.765 on Friday, up from $3.573 on March 18, and up 91.3 cents from $2.852 a year ago. Prices in several western U.S. cities are already above $4 per gallon