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The A8’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The 300 doesn’t offer pre-crash pretensioners.
Both the A8 and 300 have child safety locks to prevent children from opening the rear doors. The A8 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The 300’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
The A8 has a standard front seat center airbag, which deploys between the driver and front passenger, protecting them from injuries caused by striking each other in serious side impacts. The 300 doesn’t offer front seat center airbags.
The A8 has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The 300 doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the A8. But it costs extra on the 300.
A passive infrared night vision system optional on the A8 helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard and even aims one of the vehicle’s headlights in the direction of the person or object. The 300 doesn’t offer a night vision system.
The A8 offers an optional Top View Camera System to allow the driver to see objects all around the vehicle on a screen. The 300 only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.
Both the A8 and the 300 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, daytime running lights, rearview cameras, available lane departure warning systems, blind spot warning systems and rear cross-path warning.
The A8 comes with a full 4-year/50,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The 300’s 3-year/36,000-mile basic warranty expires 1 year and 14,000 miles sooner.
The A8’s corrosion warranty is 7 years and unlimited miles longer than the 300’s (12/unlimited vs. 5/100,000).
For smoother operation, better efficiency and fewer moving parts, the A8 has an overhead cam design, rather than the old pushrod design of the 5.7 V8 in the 300.
J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that Audi vehicles are better in initial quality than Chrysler vehicles. J.D. Power ranks Audi 25th in initial quality. With 6 more problems per 100 vehicles, Chrysler is ranked 26th.
J.D. Power and Associates’ 2018 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Audi vehicles are more reliable than Chrysler vehicles. J.D. Power ranks Audi 13th in reliability, above the industry average. With 70 more problems per 100 vehicles, Chrysler is ranked 31st.
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Chrysler vehicles. Consumer Reports ranks Audi 17 places higher in reliability than Chrysler.
The A8’s 3.0 turbo V6 hybrid produces 43 more horsepower (335 vs. 292) and 109 lbs.-ft. more torque (369 vs. 260) than the 300’s standard 3.6 DOHC V6. The A8’s 3.0 turbo V6 hybrid produces 35 more horsepower (335 vs. 300) and 105 lbs.-ft. more torque (369 vs. 264) than the 300S’ standard 3.6 DOHC V6.
On the EPA test cycle the A8 gets better fuel mileage than the 300 AWD (19 city/27 hwy vs. 18 city/27 hwy).
Regenerative brakes improve the A8’s fuel efficiency by converting inertia back into energy instead of wasting it. The 300 doesn’t offer a regenerative braking system.
In heavy traffic or at stoplights the A8’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The 300 doesn’t offer an automatic engine start/stop system.
The A8 has 3.2 gallons more fuel capacity than the 300 (21.7 vs. 18.5 gallons), for longer range between fill-ups.
For better stopping power the A8’s brake rotors are larger than those on the 300:
The A8’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs standard on the 300 are solid, not vented.
For better traction, the A8 has larger standard tires than the 300 (255/45R19 vs. 215/65R17). The A8’s optional tires are larger than the largest tires available on the 300 (265/40R20 vs. 245/45R20).
The A8’s standard tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the 300 Touring’s standard 65 series tires. The A8’s optional tires have a lower 40 series profile than the 300S/300C/Limited’s 45 series tires.
For better ride, handling and brake cooling the A8 has standard 19-inch wheels. Smaller 17-inch wheels are standard on the 300 Touring.
The front and rear suspension of the A8 uses air springs for a smoother, controlled ride than the 300, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The A8 offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Chrysler doesn’t offer an active suspension on the 300.
The A8 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 300’s suspension doesn’t offer adjustable shock absorbers.
The A8 has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The A8’s height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The 300 doesn’t offer a load leveling suspension.
For a smoother ride and more stable handling, the A8’s wheelbase is 2.9 inches longer than on the 300 (123.1 inches vs. 120.2 inches).
For better handling and stability, the track (width between the wheels) on the A8 is 1.3 inches wider in the front and .5 inches wider in the rear than on the 300.
The design of the Audi A8 amounts to more than styling. The A8 has an aerodynamic coefficient of drag of .28 Cd. That is significantly lower than the 300 (.32) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the A8 get better fuel mileage.
The A8 has .6 inches more rear headroom and 4.2 inches more rear legroom than the 300.
For enhanced passenger comfort on long trips the A8’s available rear seats recline. The 300’s rear seats don’t recline.
With its sedan body style, valet key and remote trunk release lockout, the A8 offers cargo security. The 300’s non-lockable folding seat and non-lockable remote release defeat cargo security.
To make loading and unloading groceries and cargo easier when your hands are full, the A8’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The 300 doesn’t offer a power or hands-free opening trunk.
The A8’s standard towing capacity is much higher than the 300’s (3500 vs. 1000 pounds).
J.D. Power and Associates surveys of service recipients show that Audi service is better than Chrysler. J.D. Power ranks Audi third in service department satisfaction. With a 83% lower rating, Chrysler is ranked 26th.
Unlike the driver-only memory system optional at extra cost in the 300 (except Touring/Touring L), the A8 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 A8’s standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. An easy entry system costs extra on the 300, and is not available on all models.
The A8 offers an optional heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The 300 doesn’t offer a heads-up display.
The A8’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The 300’s rear power window switches have to be held the entire time to open or close them fully.
If the windows are left open on the A8 the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the 300 can only close the windows from inside the vehicle, with the ignition on.
The A8’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The 300’s standard intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The A8 has standard headlight washers to keep headlight output high. The 300 doesn’t offer headlight washers.
Optional air conditioned front and rear seats keep the A8’s passengers comfortable and take the sting out of hot leather in summer. The 300 doesn’t offer air-conditioned seats in the rear.
The A8 offers an optional 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The 300 doesn’t offer a house-current electrical outlet.
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