2020 Porsche Cayenne Coupe vs. 2020 Mercedes GLS

Detailed Review, Specifications & Comparison

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Safety

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The Cayenne Coupe has a standard Multi-collision Brake System, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The GLS 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.

A passive infrared night vision system optional on the Cayenne Coupe 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 GLS doesn’t offer a night vision system.

Both the Cayenne Coupe and the GLS 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, blind spot warning systems, around view monitors and rear cross-path warning.

Warranty

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The Cayenne Coupe’s corrosion warranty is 7 years longer than the GLS’ (12 vs. 5 years).

Reliability

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A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the Cayenne Coupe’s reliability 51 points higher than the GLS.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Porsche vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Porsche second in reliability, above the industry average. With 26 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Porsche vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Porsche fourth in reliability. Mercedes is ranked 21st.

Engine

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The Cayenne Coupe has more powerful engines than the GLS:

Horsepower

Torque

Cayenne S Coupe 2.9 turbo V6

434 HP

406 lbs.-ft.

Cayenne E-Hybrid Coupe 3.0 turbo V6

455 HP

516 lbs.-ft.

Cayenne Turbo Coupe 4.0 turbo V8

541 HP

568 lbs.-ft.

Cayenne Turbo S E-Hybrid Coupe 4.0 turbo V8

670 HP

663 lbs.-ft.

GLS 450 3.0 turbo 6-cylinder hybrid

362 HP

369 lbs.-ft.

GLS 580 4.0 turbo V8 hybrid

483 HP

516 lbs.-ft.

Fuel Economy and Range

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On the EPA test cycle the Cayenne E-Hybrid Coupe running on electricity gets better fuel mileage than the GLS 450 (45 city/37 hwy MPGe vs. 19 city/23 hwy).

The Cayenne Turbo S E-Hybrid Coupe can drive on battery power alone for up to 31 miles. The GLS must run its internal combustion engine to move.

Transmission

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The Cayenne Coupe’s optional 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 GLS doesn’t offer launch control.

Brakes and Stopping

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

Cayenne S

Cayenne Turbo

Cayenne opt.

GLS

Front Rotors

15.4 inches

16.3 inches

17.3 inches

14.8 inches

Rear Rotors

13 inches

14.4 inches

16.1 inches

13.6 inches

The Cayenne Coupe offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The GLS doesn’t offer ceramic brake rotors.

The Cayenne Coupe Turbo has standard air brakes, which adjust the spoiler automatically during high-speed braking in order to shorten stopping distances. The GLS doesn’t offer air brakes.

Tires and Wheels

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For better traction, the Cayenne Coupe has larger standard tires than the GLS (F:275/45R20 & R:305/40R20 vs. 255/50R19). The Cayenne Coupe’s optional tires are larger than the largest tires available on the GLS (F:285/40R21 & R:315/35R21 vs. 275/50R20).

The Cayenne Coupe’s standard 275/45R20 front and 305/40R20 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 GLS’ standard 50 series tires. The Cayenne Coupe’s optional 285/35R22 front and 315/30R22 rear tires have a lower 35 series front and 30 series rear profile than the GLS’ 50 series tires.

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

Suspension and Handling

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The Cayenne Coupe offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The GLS doesn’t offer an active sway bar system.

Chassis

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The Porsche Cayenne Coupe may be more efficient, handle and accelerate better because it weighs about 50 to 1050 pounds less than the Mercedes GLS.

The Cayenne Coupe is 10.8 inches shorter than the GLS 450, making the Cayenne Coupe easier to handle, maneuver and park in tight spaces.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Porsche service is better than Mercedes. J.D. Power ranks Porsche first in service department satisfaction. With a 23% lower rating, Mercedes is ranked fifth.

Ergonomics

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The Cayenne Coupe’s instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The GLS has neither an oil pressure gauge nor a temperature gauge.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The Cayenne Coupe offers available headlight washers to keep headlight output high. The GLS doesn’t offer headlight washers.

Recommendations

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/07/06

Consumer Reports® recommends the Porsche Cayenne Coupe, based on reliability, safety and performance. The Mercedes GLS isn't recommended.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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