![Roadshow Reviews (HD) show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/028/359/small/car-tech-hd.jpg)
Summary: BMW's flagship luxury sedan can be had with a plug-in hybrid powertrain, but does the efficiency boost have a performance cost?
Summary: BMW's flagship luxury sedan can be had with a plug-in hybrid powertrain, but does the efficiency boost have a performance cost?