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2017 Cadillac CT6 Plug-In: Our View
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By: Cars.com On: 12-04-2017 Model(s): General Motors is making a big push for electrified vehicles over the next few years, and the technology won't be limited to mass-market Chevrolets. 2017 Cadillac CT6
Author Experience: Expert review

General Motors is making a big push for electrified vehicles over the next few years, and the technology won't be limited to mass-market Chevrolets. Exhibit one: the new 2017 CT6 Plug-In, a gas-electric hybrid luxury flagship sedan from the Cadillac brand. The last time Cadillac tried to do a plug-in hybrid, we got a gorgeous compact coupe built off the Chevy Volt platform — the horribly overpriced, short-lived Cadillac ELR. That formula did not work, so now Cadillac is trying something new.

The new car you see here is more unique than you might imagine: It's the only Cadillac you can buy in North America that isn't made here. The unique nature of this Cadillac means its biggest market isn't the United States — it's China, where the government is pushing electric vehicles hard in an effort to clean up stifling air pollution.

We're starting to see the same sentiment here, with California in particular pursuing zero-emission-vehicle requirements. But just because the next generation of cars is going greener doesn't mean people want to give up their creature comforts. So with fuel-efficient, green luxury in mind, Cadillac presents us with this leather-lined land yacht you can plug into a wall socket.

The CT6 has been around a couple of years now, but you'd be forgiven for not knowing what it is; it isn't lighting the roads on fire with sales. In fact, Cadillac has sold just over 8,000 of them this year to date, making them an extremely rare sight on American roads.

That's not because the CT6 is unattractive: It's a long, low, sleek design that, frankly, doesn't look all that different from the smaller CTS sedan. Maybe it's the odd name. Maybe it's the fact that it doesn't look all that distinctive. Maybe it's because it doesn't look anything like the exquisite Cadillac Ciel or Elmiraj concept cars we saw prior to its launch, but folks aren't snapping this car up based on its looks.

That's a shame, because the CT6 driving experience is quite good. The CT6 Plug-In operates a little differently from other models in the CT6 lineup, so a little technical background is necessary here.

The CT6 is the top Cadillac sedan, and it's available with four powertrains. The Plug-In combines a 2.0-liter, turbocharged four-cylinder engine with a special transmission — an electronically variable unit with two integrated electric motors. Sort of a mashup of a continuously variable automatic transmission and a planetary gearset, it's actually a bit more complicated than that. The transmission features four variable gear ratio spreads, three fixed ones and five clutches, but it feels similar to most CVTs I've driven. Total system output is 335 horsepower and 432 pounds-feet of torque — nothing to sniff at. It propels the car from zero to 60 mph in just 5.2 seconds, Cadillac says.
 
The hybrid system is powered by a lithium-ion battery pack that eats up about half of the CT6's previously available trunk space. It's an 18.4-kilowatt-hour pack — about as big as you'll find in a Chevrolet Volt — and has enough juice to propel the CT6 for about 31 miles on electric power alone. It recharges in a little over four hours on 240 volts and 20 amps, or overnight on a 120-volt household plug. That's a considerably better electric range than the CT6 Plug-In's rivals; the BMW 740e plug-in goes only 14 miles on a full charge, while the new 2018 Volvo S90 Hybrid manages only 21 miles.

Once the battery is empty, the gas engine provides power to the wheels and electricity to the system to keep you going more than 400 additional miles at an average of 26 mpg. (The 740e gets an estimated 27 mpg but goes only 326 gas-powered miles between fill-ups.) The gas engine can provide some direct supplemental grunt when you ask the CT6 to accelerate faster than the two electric motors alone can manage, but most of the time the CT6 stays in electric-only mode.

As a result, the CT6 Plug-In doesn't drive like a regular gas-powered Cadillac. Instead, it feels like a great big EV — silent, smooth and dead quiet, with the occasional gurgle, whine or thunk from the hybrid powertrain. Around town, it keeps things electric as much as possible — unless you dip your accelerator foot past the halfway point, in which case it fires up the gas engine after a slight hesitation. It's a weirdly unnerving feeling; just when you've called for more power, the car hiccups for a second before surging forward. The gas engine also fires up if you get above 78 mph on the highway, and there's a "hold" mode you can activate to use the gas engine all the time, reserving your battery power for low-speed city driving, where it's most efficient.

The same excellent steering, handling and ride quality we've experienced in other CT6s remain in the heavier plug-in hybrid, but the brakes take some getting used to. They're regenerative brakes, like you'll find in all hybrids and EVs, and the first bit of pedal travel engages the electric motors to slow you down before the brakes themselves start working, in order to recapture as much energy as possible into the batteries. Problem is, it feels artificial and nonlinear — like most hybrid car brakes.

The CT6 Plug-In allows you to adjust those regenerative brakes to be more or less aggressive. The standard setting is M4, which includes very little regeneration. You can use the paddles on the steering wheel or the console shifter to bump that up all the way to level M1, where you'll experience what's called "one-pedal driving." In this mode you rarely need to touch the brakes; as soon as you lift your foot from the go pedal the car aggressively begins to decelerate for maximum energy recapture. If you do a lot of city driving it'll take a little getting used to, but it can make a measurable difference in extending the car's electric range. I was able to coax 41 miles out of the CT6 in electric-only mode thanks to some careful, but not overly slow, driving.

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