European automaker shares rose sharply on Thursday after President Donald Trump moved to roll back U.S. fuel economy limits established under Joe Biden, according to Reuters. The administration framed the proposal as a way to lower consumer costs by making it easier for companies to sell gasoline-powered vehicles. By mid-morning, Porsche shares were up more than 5%, Mercedes-Benz and Volvo Car gained nearly 4%, Renault rose 3.3%, and Stellantis climbed around 2.7% after an 8% rally the previous day. Speaking from the Oval Office alongside…