2017 Cadillac CT6 Plug-in Hybrid is the most efficient and torquey CT6 of all

The company has taken its CT6 flagship and given it a turbocharged 2.0-liter four-cylinder, a pair of motors, and a big battery pack. The result of this combination is a CT6 that manages a rating of 65 MPGe, can go 30 miles on a full electric charge or 400 miles combined with the engine.

The powertrain produces 335 horsepower and 432 lb-ft of torque. That's the same amount of power as the 3.6-liter V6 CT6, and more torque than that engine or the twin-turbo 3.0-liter V6. Cadillac claims the CT6 plug-in is capable of hitting 60 miles per hour in 5.2 seconds and reaching a top speed of 150 mph.

The green and grunty CT6 plug-in will be available this coming spring, and it will have a premium price of $76,090. Cadillac says that its equipment list is comparable to the CT6 Premium Luxury trim level, which starts at $64,590 with the 3.6-liter V6, and $68,590 with the twin-turbo V6. However, in addition to the hybrid powertrain, Cadillac throws in a number of features that are options on the conventional gasoline models. To get the hybrid's rear seat infotainment system and enhanced night vision, a buyer would have to add $5,800 in option packages. That still leaves the twin-turbo model $1,700 shy of the hybrid, but that's not a terrible trade for the option of fuel-free driving for at least some of the time.