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Over 200 people are killed each year when backed over by motor vehicles. The K900 has standard Rear Cross-Traffic Collision Avoidance Assist that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The RLX doesn’t offer backup collision prevention brakes.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the K900. But it costs extra on the RLX.
The K900’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 RLX doesn’t offer a driver alert monitor.
Both the K900 and the RLX 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, blind spot warning systems, rearview cameras and rear cross-path warning.
The K900 comes with a full 5-year/60,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The RLX’s 4-year/50,000-mile basic warranty expires 1 year and 10,000 miles sooner.
Kia’s powertrain warranty covers the K900 4 years and 30,000 miles longer than Acura covers the RLX. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 10 years or 100,000 miles. Coverage on the RLX ends after only 6 years or 70,000 miles.
There are almost 3 times as many Kia dealers as there are Acura dealers, which makes it much easier should you ever need service under the K900’s warranty.
J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Kia vehicles are better in initial quality than Acura vehicles. J.D. Power ranks Kia second in initial quality, above the industry average. With 40 more problems per 100 vehicles, Acura is ranked 24th, below the industry average.
J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Kia vehicles are more reliable than Acura vehicles. J.D. Power ranks Kia 10th in reliability, above the industry average. With 45 more problems per 100 vehicles, Acura is ranked 26th.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Kia vehicles are more reliable than Acura vehicles. Consumer Reports ranks Kia 19 places higher in reliability than Acura.
The K900’s 3.3 turbo V6 produces 55 more horsepower (365 vs. 310) and 104 lbs.-ft. more torque (376 vs. 272) than the RLX’s standard 3.5 SOHC V6. The K900’s 3.3 turbo V6 produces 35 lbs.-ft. more torque (376 vs. 341) than the RLX Sport Hybrid’s standard 3.5 SOHC V6 hybrid.
The K900 has 5.2 gallons more fuel capacity than the RLX Sport Hybrid’s standard fuel tank (20.3 vs. 15.1 gallons), for longer range between fill-ups. The K900 has 1.8 gallons more fuel capacity than the RLX’s standard fuel tank (20.3 vs. 18.5 gallons).
For better stopping power the K900’s brake rotors are larger than those on the RLX:
RLX Sport Hybrid
For better traction and acceleration, the K900 has larger rear tires than the RLX (275/40R19 vs. 245/40R19).
The K900 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the RLX, it requires you to depend on roadside assistance and your vehicle will have to be towed.
The K900 has a standard driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The RLX’s suspension doesn’t offer adjustable shock absorbers.
For a smoother ride and more stable handling, the K900’s wheelbase is 10 inches longer than on the RLX (122.2 inches vs. 112.2 inches).
The K900 handles at .87 G’s, while the RLX pulls only .80 G’s of cornering force in a Motor Trend skidpad test.
The K900 executes Motor Trend’s “Figure Eight” maneuver 1.6 seconds quicker than the RLX (25.7 seconds @ .72 average G’s vs. 27.3 seconds @ .64 average G’s).
For better maneuverability, the K900’s turning circle is 1.3 feet tighter than the RLX’s (39.2 feet vs. 40.5 feet).
The front grille of the K900 uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The RLX doesn’t offer active grille shutters.
Because it has more passenger and cargo room, the EPA rates the K900 a Large car, while the RLX is rated a Mid-size.
The K900 has 7.9 cubic feet more passenger volume than the RLX (110 vs. 102.1).
The K900 has 3.5 inches more front headroom, 3.4 inches more front legroom, 1.1 inches more rear headroom and .2 inches more rear shoulder room than the RLX.
For enhanced passenger comfort on long trips the K900’s available rear seats recline. The RLX’s rear seats don’t recline.
To make loading and unloading groceries and cargo easier when your hands are full, the K900’s power trunk can be opened just by waiting momentarily behind the back bumper, leaving your hands completely free. The K900’s power trunk can also be opened or closed by pressing a button. The RLX doesn’t offer a power or hands-free opening trunk.
The engine in the K900 is mounted longitudinally (North-South), instead of sideways, as in the RLX. This makes it easier to service and maintain, because there are no rear spark plugs and the accessory belts are in front.
Unlike the driver-only memory system in the RLX, the K900 has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.
The power windows standard on both the K900 and the RLX have locks to prevent small children from operating them. When the lock on the K900 is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The RLX prevents the driver from operating the other windows just as it does the other passengers.
To help drivers see further while navigating curves, the K900 has standard adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The RLX doesn’t offer cornering lights.
The K900 has standard front air conditioned seats and offers them optionally in the rear. This keeps the passengers comfortable and takes the sting out of hot seats in summer. The RLX doesn’t offer air-conditioned seats in the rear.
The K900 has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the car heater warms up. A heated steering wheel is only available on the RLX Sport Hybrid.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Kia K900 has a standard wireless phone charging system (Qi) in the center console and for the rear passengers. The RLX doesn’t offer wireless personal charging.
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