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The GLC’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Cayenne Coupe doesn’t offer pre-crash pretensioners.
The GLC has standard NECK-PRO front head restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the NECK-PRO front head restraints system moves the headrests forward to prevent neck and spine injuries. The Cayenne Coupe doesn’t offer a whiplash protection system.
The GLC’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 Cayenne Coupe doesn’t offer a driver alert monitor.
Both the GLC and the Cayenne Coupe have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, 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 all-wheel drive, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.
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 front crash prevention system, and its headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the GLC its highest rating: “Top Pick Plus” for 2019, a rating granted to only 55 vehicles tested by the IIHS. The Cayenne Coupe has not been tested, yet.
There are over 2 times as many Mercedes dealers as there are Porsche dealers, which makes it much easier should you ever need service under the GLC’s warranty.
J.D. Power and Associates rated the GLC third among compact premium suvs in their 2019 Initial Quality Study. The Cayenne Coupe isn’t in the top three in its category.
J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Porsche vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 2 more problems per 100 vehicles, Porsche is ranked 15th.
On the EPA test cycle the GLC 300 4MATIC gets better fuel mileage than the Cayenne Coupe with its standard engine (21 city/28 hwy vs. 19 city/23 hwy).
A nine-speed automatic is standard on the Mercedes GLC, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the Cayenne Coupe.
In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The GLC has a standard brake assist system to detect emergency braking situations (by how hard and how quickly the brake pedal is pressed) and then automatically apply maximum braking immediately in order to help prevent a collision. The Cayenne Coupe doesn’t offer a brake assist feature.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the GLC can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Cayenne Coupe doesn’t offer run-flat tires.
The GLC’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The Cayenne Coupe doesn’t offer drift compensation steering.
The GLC’s front to rear weight distribution is more even (53% to 47%) than the Cayenne Coupe’s (55.9% to 44.1%). This gives the GLC more stable handling and braking.
For better maneuverability, the GLC’s turning circle is 1.1 feet tighter than the Cayenne Coupe’s (38.7 feet vs. 39.8 feet).
The Mercedes GLC may be more efficient, handle and accelerate better because it weighs about 750 to 1650 pounds less than the Porsche Cayenne Coupe.
The GLC is 10.9 inches shorter than the Cayenne Coupe, making the GLC easier to handle, maneuver and park in tight spaces.
The design of the Mercedes GLC amounts to more than styling. The GLC has an aerodynamic coefficient of drag of .31 Cd. That is lower than the Cayenne Coupe (.34 to .35) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the GLC get better fuel mileage.
The front grille of the GLC uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The Cayenne Coupe doesn’t offer active grille shutters.
The GLC has a larger cargo volume with its rear seat folded than the Cayenne Coupe with its rear seat folded (56.5 vs. 54.3 cubic feet).
Pressing a switch automatically lowers the GLC’s rear seats, to make changing between passengers and cargo easier. The Cayenne Coupe doesn’t offer automatic folding seats.
The GLC has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The Cayenne Coupe doesn’t offer a remote starting system.
The GLC’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. An easy entry system costs extra on the Cayenne Coupe.
If the windows are left open on the GLC 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 Cayenne Coupe can only operate the windows from inside the vehicle, with the ignition on.
The GLC’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The Cayenne Coupe’s cruise control switches are unlit, making them difficult to find at night and operate safely.
Heated windshield washer nozzles are optional on the GLC to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The Cayenne Coupe doesn’t offer heated windshield washer nozzles.
To improve rear visibility by keeping the rear window clear, the GLC has a standard rear wiper. The Cayenne Coupe doesn’t offer a rear wiper.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the GLC has standard extendable sun visors. The Cayenne Coupe doesn’t offer extendable visors.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes GLC offers an optional wireless phone charging system (Qi) in the center console. The Cayenne Coupe doesn’t offer wireless personal charging.
The GLC has a 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 Cayenne Coupe doesn’t offer a house-current electrical outlet.
The GLC’s optional Active Parking Assist can parallel park or back into a parking spot by itself, starting and stopping automatically, with the driver only responsible for switching from reverse to drive. The Cayenne Coupe doesn’t offer an automated parking system.
The GLC is available in both rear-wheel drive and four-wheel drive configurations. The Cayenne Coupe doesn’t offer a two-wheel drive configuration.
Motor Trend selected the GLC as their 2017 Sport Utility of the Year. The Cayenne Coupe has never been chosen.
The Mercedes GLC outsold the Porsche Cayenne by almost four to one during the 2019 model year.
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