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Both the A8 and G80 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 G80’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 G80 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 G80 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 G80.
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 G80 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 G80 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 G80 have standard driver and passenger frontal airbags, front and rear 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, rearview cameras, available lane departure warning systems, blind spot warning systems and rear cross-path warning.
The A8’s corrosion warranty is 5 years longer than the G80’s (12 vs. 7 years).
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Genesis vehicles. Consumer Reports ranks Audi 5 places higher in reliability than Genesis.
The A8’s 3.0 turbo V6 hybrid produces 24 more horsepower (335 vs. 311) and 76 lbs.-ft. more torque (369 vs. 293) than the G80 3.8’s standard 3.8 DOHC V6.
On the EPA test cycle the A8 gets better fuel mileage than the G80 3.8 AWD (19 city/27 hwy vs. 18 city/24 hwy). The A8 gets better fuel mileage than the G80 3.3T AWD (19 city/27 hwy vs. 17 city/24 hwy).
Regenerative brakes improve the A8’s fuel efficiency by converting inertia back into energy instead of wasting it. The G80 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 G80 doesn’t offer an automatic engine start/stop system.
The A8 has 1.4 gallons more fuel capacity than the G80 (21.7 vs. 20.3 gallons), for longer range between fill-ups.
For better stopping power the A8’s brake rotors are larger than those on the G80:
G80 3.3T Sport
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 G80 3.8 are solid, not vented.
For better traction, the A8 has larger standard tires than the G80 (255/45R19 vs. 245/45R18). The A8’s optional tires are larger than the largest tires available on the G80 (265/40R20 vs. 245/40R19).
For better ride, handling and brake cooling the A8 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the G80 3.8. The A8’s optional 20-inch wheels are larger than the 19-inch wheels optional on the G80.
The front and rear suspension of the A8 uses air springs for a smoother, controlled ride than the G80, 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. Genesis doesn’t offer an active suspension on the G80.
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 G80 doesn’t offer a load leveling suspension.
For a smoother ride and more stable handling, the A8’s wheelbase is 4.6 inches longer than on the G80 (123.1 inches vs. 118.5 inches).
The A8 has .8 inches more front shoulder room, .3 inches more rear headroom, 9.3 inches more rear legroom and .5 inches more rear shoulder room than the G80.
For enhanced passenger comfort on long trips the A8’s available rear seats recline. The G80’s rear seats don’t recline.
The A8 has a 3500 lbs. towing capacity. The G80 has no towing capacity.
Unlike the driver-only memory system in the G80, 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 G80.
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 G80 can only operate the windows from inside the vehicle, with the ignition on.
Optional air conditioned front and rear seats keep the A8’s passengers comfortable and take the sting out of hot leather in summer. The G80 only offers an air-conditioned driver’s seat.
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 G80 doesn’t offer a house-current electrical outlet.
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