GM told Business Insider it's making another several hundred million-dollar investment in US manufacturing. John F. Martin for General Motors GM is investing $340 million in two facilities to build its popular gas cars. EV sales "didn't go as quickly as we thought it was going to," an executive told Business Insider. Overall, the company has invested $6 billion in US facilities in the past 12 months. General Motors is making a fresh $340 million investment in its US plants. The latest inves...