2019 Toyota Prius Prime vs. 2018 Cadillac CT6 Plug-In

Detailed Review, Specifications & Comparison

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The Prius Prime’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The CT6 Plug-In doesn’t offer a driver alert monitor.

Both the Prius Prime and the CT6 Plug-In have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, available blind spot warning systems, rear parking sensors and rear cross-path warning.

For its top level performance in IIHS driver-side small overlap frontal, moderate overlap frontal, side impact, rear impact and roof-crush tests, with its optional front crash prevention system, its “Acceptable” rating in the new passenger-side small overlap crash test, and its headlight’s “Acceptable” rating, the Insurance Institute for Highway Safety grants the Prius Prime the rating of “Top Pick” for 2019, a rating granted to only 85 vehicles tested by the IIHS. The CT6 Plug-In has not been tested, yet.


Toyota pays for scheduled maintenance on the Prius Prime for 2 years and 25000 miles. Toyota will pay for oil changes, lubrication and any other required maintenance. Cadillac only pays for the first scheduled maintenance visit on the CT6 Plug-In.

There are over 36 percent more Toyota dealers than there are Cadillac dealers, which makes it easier should you ever need service under the Prius Prime’s warranty.


The CT6 Plug-In’s redline is at 7000 RPM, which causes more engine wear, and a greater chance of a catastrophic engine failure. The Prius Prime has a 4000 RPM redline.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Toyota vehicles are more reliable than Cadillac vehicles. J.D. Power ranks Toyota second in reliability, above the industry average. With 58 more problems per 100 vehicles, Cadillac is ranked 23rd.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Toyota vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks Toyota second in reliability. Cadillac is ranked 28th.

Fuel Economy and Range

On the EPA test cycle the Prius Prime gets better fuel mileage than the CT6 Plug-In:







Running on electricity (MPGe)

145 city/121 hwy

56 city/71 hwy



Running gasoline engine

55 city/53 hwy

23 city/29 hwy


To lower fuel costs and make buying fuel easier, the Toyota Prius Prime uses regular unleaded gasoline. The CT6 Plug-In requires premium for maximum efficiency, which can cost 20 to 55 cents more per gallon.

Suspension and Handling

For better maneuverability, the Prius Prime’s turning circle is 6.6 feet tighter than the CT6 Plug-In’s (33.4 feet vs. 40 feet).


The Toyota Prius Prime may be more efficient, handle and accelerate better because it weighs about 1150 pounds less than the Cadillac CT6 Plug-In.

The Prius Prime is 1 foot, 9.2 inches shorter than the CT6 Plug-In, making the Prius Prime easier to handle, maneuver and park in tight spaces.

The front grille of the Prius Prime uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The CT6 Plug-In doesn’t offer active grille shutters.

Cargo Capacity

The Prius Prime has a much larger trunk than the CT6 Plug-In (19.8 vs. 10.6 cubic feet).

A low lift-over trunk design makes loading and unloading the Prius Prime easier. The Prius Prime’s trunk lift-over height is 26.5 inches, while the CT6 Plug-In’s liftover is 29.1 inches.

The Prius Prime’s standard rear seats fold to accommodate long and bulky cargo. The CT6 Plug-In doesn’t offer folding rear seats.


On extremely cold winter days, the Prius Prime Advanced’s standard heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The CT6 Plug-In doesn’t offer a heated steering wheel.


Consumer Reports® recommends the Toyota Prius Prime, based on reliability, safety and performance.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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