Shares of electric vehicle manufacturers NIO (NIO 8.23%), Lucid Group (LCID 2.25%), and Rivian Automotive (RIVN 4.05%) are down sharply from their 2021 highs -- 58%, 75%, and 81%, respectively. That makes them very attractive when you consider the near certainty that EV sales are going to continue to grow. But when comparing those companies to legacy automakers Ford (F -1.23%) and General Motors (GM 0.07%) on this one key metric, there's something investors should be very cautious about. In this video, Fool contributors Jason Hall and Jeff Santoro talk about that very important number.
*Stock prices used were the afternoon prices of Sept. 21, 2022. The video was published on Sept. 22, 2022.
