Seeking to control sky-high summertime fuel prices, the U.S. EPA proposed new regulations for anti-smog gasoline yesterday. The EPA has been gradually phasing in a plan to combat summer smog in densely populated areas by mandating the use of cleaner-burning reformulated gasoline (RFG). The oil industry blames that plan for high prices at the pumps — close to $3 per gallon in some metropolitan areas last summer. Among other measures, the proposal calls for less stringent ingredient specifications for clean gasoline, and would allow some non-RFG fuels to be reclassified as RFG to meet use requirements in the summer.