Cadillac is selling just under 1,000 CT6 luxury turnpike dominators a month here in America, a relatively small volume already split between a couple of engine choices and a few trim levels. So it might seem intriguing that Cadillac is adding an entirely new drivetrain to the CT6 mix: a plug-in hybrid.
Granted, it’s a good plug-in hybrid, with a hefty 18.4-kWh lithium-ion battery behind the rear seat good for 31 miles of pure electric propulsion, a 62 MPGe rating from the EPA and a luxury-class-reasonable $76,090 sticker for its fully loaded, one trim-level model. But still. Why is Cadillac adding a plug-in hybrid?