The federal government's weekly survey shows that in L.A. the average price of a gallon of self-serve regular was $3.34 for the week ended June 4. That's down from $3.38 the week before. In S.F., it was $3.49, and in Chicago, which still has some of the nation's highest prices, it's $3.56. A government forecaster told Reuters that prices have hit a short-term peak and drivers could see a further decline of 5 cents to 10 cents a gallon at the pump this month. One reason for the drop: more refineries are coming back online.