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Both the A6 Allroad and GLC have child safety locks to prevent children from opening the rear doors. The A6 Allroad 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 GLC’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 A6 Allroad 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 GLC 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 A6 Allroad. But it costs extra on the GLC.
When descending a steep, off-road slope, the A6 Allroad’s standard Hill Descent Control allows you to creep down safely. The GLC doesn’t offer Hill Descent Control.
A passive infrared night vision system optional on the A6 Allroad Prestige 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. The GLC doesn’t offer a night vision system.
Both the A6 Allroad and the GLC have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front and rear 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 blind spot warning systems and rear cross-path warning.
The Audi A6 Allroad weighs 485 to 595 pounds more than the Mercedes GLC. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard vehicle-to-vehicle front crash prevention system, its standard vehicle-to-pedestrian front crash prevention system, and its standard headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the A6 Allroad its highest rating: “Top Pick Plus” for 2020, a rating granted to only 32 vehicles tested by the IIHS. The GLC has not been fully tested, yet.
The A6 Allroad’s corrosion warranty is 7 years longer than the GLC’s (12 vs. 5 years).
J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Audi vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Audi 8th in reliability, above the industry average. With 10 more problems per 100 vehicles, Mercedes is ranked 13th.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Audi vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Audi 7 places higher in reliability than Mercedes.
The A6 Allroad’s 3.0 turbo V6 hybrid produces 80 more horsepower (335 vs. 255) and 96 lbs.-ft. more torque (369 vs. 273) than the GLC’s 2.0 turbo 4-cylinder.
Regenerative brakes improve the A6 Allroad’s fuel efficiency by converting inertia back into energy instead of wasting it. The GLC doesn’t offer a regenerative braking system.
The A6 Allroad has 1.9 gallons more fuel capacity than the GLC (19.3 vs. 17.4 gallons), for longer range between fill-ups.
The A6 Allroad offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The GLC doesn’t offer an SMG or a conventional manual transmission.
The A6 Allroad’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The GLC doesn’t offer launch control.
For better stopping power the A6 Allroad’s brake rotors are larger than those on the GLC:
For better traction, the A6 Allroad has larger tires than the GLC (245/45R20 vs. 235/60R18).
The A6 Allroad’s tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the GLC’s standard 60 series tires.
For better ride, handling and brake cooling the A6 Allroad has standard 20-inch wheels. Smaller 18-inch wheels are standard on the GLC.
The A6 Allroad 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 GLC; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed.
For a smoother ride and more stable handling, the A6 Allroad’s wheelbase is 2.1 inches longer than on the GLC (115.2 inches vs. 113.1 inches).
For better maneuverability, the A6 Allroad Prestige w/All-Wheel Steering’s turning circle is 2.3 feet tighter than the GLC’s (36.4 feet vs. 38.7 feet).
For greater off-road capability the A6 Allroad Premium Plus has a 1.1 inches greater minimum ground clearance than the GLC (6.1 vs. 5 inches), allowing the A6 Allroad to travel over rougher terrain without being stopped or damaged. The A6 Allroad Prestige’s minimum ground clearance is 2.3 inches higher than on the GLC (7.3 vs. 5 inches).
The design of the Audi A6 Allroad amounts to more than styling. The A6 Allroad has an aerodynamic coefficient of drag of .29 Cd. That is lower than the GLC (.31) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the A6 Allroad get better fuel mileage.
The A6 Allroad has .5 inches more front headroom, .5 inches more front legroom, .5 inches more front shoulder room, 1 inch more rear headroom and .1 inches more rear legroom than the GLC.
The A6 Allroad has a much larger cargo volume than the GLC with its rear seat up (30 vs. 19.4 cubic feet).
A low lift-over trunk design makes loading and unloading the A6 Allroad easier. The A6 Allroad’s trunk lift-over height is 27 inches, while the GLC’s liftover is 28.8 inches.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The A6 Allroad has standard headlight washers to keep headlight output high. The GLC doesn’t offer headlight washers.
The A6 Allroad 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 costs extra on the GLC.
The A6 Allroad Prestige offers optional massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the GLC.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Audi A6 Allroad has a standard wireless phone charging system (Qi) in the center console. Wireless charging costs extra on the GLC.
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