President Joe Biden launched an aggressive attack on gasoline prices last week, enlisting China and other nations in a possible joint release of oil reserves, and sharpening a probe into oil giants’ pricing. The efforts may have limited impact on prices at the pump, experts say, but doing nothing would be a political mistake as gasoline prices hit a seven-year high . The average U.S. retail gasoline price is $3.41 a gallon, up from $2.11 a year ago, according to the American Automobile Association. Americans are by far the world’s heaviest consumers of gasoline, thanks to big cars, long driving distances and little public transportation in many areas. “Americans expect the president to do something about this,” said […]