Plug-in hybrids top 20% of Volvo’s US sales

2021 Volvo S60Volvo's plug-in hybrids are steadily gaining market share. As part of its monthly sales recap, the automaker announced Monday that plug-in hybrids accounted for 20.8% of its United States sales in May. The number was even higher in California, where plug-in hybrids accounted for 47.7% of Volvo's U.S. sales in May. The national sales figures mean...