2020 Mercedes AMG GLC Coupe vs. 2020 Porsche Cayenne

Detailed Review, Specifications & Comparison

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Safety

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The AMG GLC Coupe’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Cayenne doesn’t offer pre-crash pretensioners.

The AMG GLC Coupe’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 doesn’t offer a driver alert monitor.

Both the AMG GLC Coupe and the Cayenne 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, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems, around view monitors and rear cross-path warning.

Warranty

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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 AMG GLC Coupe’s warranty.

Reliability

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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.

Engine

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As tested in Motor Trend the AMG GLC 63 S Coupe is faster than the Cayenne E-Hybrid:

AMG GLC

Cayenne

Zero to 60 MPH

3.2 sec

4.2 sec

Quarter Mile

11.7 sec

12.7 sec

Speed in 1/4 Mile

116.5 MPH

110.2 MPH

Fuel Economy and Range

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On the EPA test cycle the AMG GLC Coupe gets better fuel mileage than the Cayenne:

MPG

AMG GLC Coupe

43 3.0 turbo V6

18 city/24 hwy

63 4.0 turbo V8

16 city/22 hwy

63 S 4.0 turbo V8

16 city/22 hwy

Cayenne

S 2.9 turbo V6

18 city/22 hwy

Turbo 4.0 turbo V8

15 city/19 hwy

Environmental Friendliness

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In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes AMG GLC Coupe higher (5 out of 10) than the Porsche Cayenne (3 to 5). This means the AMG GLC Coupe produces up to 16.5 pounds less smog-producing pollutants than the Cayenne every 15,000 miles.

Transmission

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A nine-speed automatic is standard on the Mercedes AMG GLC Coupe, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the Cayenne.

Brakes and Stopping

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For better stopping power the AMG GLC Coupe’s standard front brake rotors are larger than those on the Cayenne:

AMG GLC

Cayenne

Front Rotors

14.2 inches

13.8 inches

In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The AMG GLC Coupe 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 doesn’t offer a brake assist feature.

The AMG GLC Coupe stops shorter than the Cayenne:

AMG GLC

Cayenne

70 to 0 MPH

158 feet

160 feet

Car and Driver

60 to 0 MPH

105 feet

113 feet

Motor Trend

Tires and Wheels

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For better traction and acceleration, the AMG GLC Coupe has larger standard rear tires than the Cayenne (285/40R20 vs. 275/50R19).

The AMG GLC 63 Coupe’s standard 265/45R20 front and 295/40R20 rear tires provide better handling because they have a lower 45 series front and 40 series rear profile (height to width ratio) that provides a stiffer sidewall than the Cayenne’s standard 55 series front and 50 series rear tires.

For better ride, handling and brake cooling the AMG GLC Coupe has standard 20-inch wheels. Smaller 19-inch wheels are standard on the Cayenne.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG GLC Coupe can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Cayenne doesn’t offer run-flat tires.

Suspension and Handling

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The front and rear suspension of the AMG GLC Coupe uses air springs for a smoother, controlled ride than the Cayenne, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

The AMG GLC Coupe’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 doesn’t offer drift compensation steering.

The AMG GLC 63 S Coupe handles at .96 G’s, while the Cayenne E-Hybrid pulls only .87 G’s of cornering force in a Motor Trend skidpad test.

The AMG GLC 63 S Coupe executes Motor Trend’s “Figure Eight” maneuver 1.3 seconds quicker than the Cayenne E-Hybrid (24.1 seconds @ .85 average G’s vs. 25.4 seconds @ .78 average G’s).

Chassis

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The Mercedes AMG GLC Coupe may be more efficient, handle and accelerate better because it weighs about 350 to 1100 pounds less than the Porsche Cayenne.

The AMG GLC 63 Coupe is 6.8 inches shorter than the Cayenne, making the AMG GLC Coupe easier to handle, maneuver and park in tight spaces.

Cargo Capacity

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Pressing a switch automatically lowers the AMG GLC Coupe’s rear seats, to make changing between passengers and cargo easier. The Cayenne doesn’t offer automatic folding seats.

Ergonomics

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The AMG GLC Coupe 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 doesn’t offer a remote starting system.

The AMG GLC Coupe’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 Cayenne.

If the windows are left open on the AMG GLC Coupe the driver can close them all at the outside door handle or from a distance using the remote (remote must be aimed at door sensor). On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the Cayenne can only operate the windows from inside the vehicle, with the ignition on.

Heated windshield washer nozzles are standard on the AMG GLC Coupe to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The Cayenne doesn’t offer heated windshield washer nozzles.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the AMG GLC Coupe has standard extendable sun visors. The Cayenne doesn’t offer extendable visors.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes AMG GLC offers an optional wireless phone charging system (Qi) in the center console. The Cayenne doesn’t offer wireless personal charging.

The AMG GLC Coupe has a 115-volt a/c outlet, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Cayenne doesn’t offer a house-current electrical outlet.

Economic Advantages

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Insurance will cost less for the AMG GLC Coupe owner. The Complete Car Cost Guide estimates that insurance for the AMG GLC Coupe will cost $2165 less than the Cayenne over a five-year period.

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