For six months, one in five Prius sales has been a plug-in hybrid

2017 Toyota Prius Prime, Dallas, TexasA funny thing happened to Toyota Prius hybrid sales last month. Almost one in three Prius hybrids sold in the U.S. were the Prius Prime model—the one with a plug. Toyota may be the large automaker least friendly to cars that plug in, so what's that all about? DON'T MISS: Toyota Prius hybrid sales have tanked: here are 4 reasons why In the...