2020 Mercedes G-Class vs. 2020 Porsche Cayenne Coupe

Detailed Review, Specifications & Comparison

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Safety

© 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 2020/02/24

The G-Class’ 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 G-Class’ 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 G-Class and the Cayenne Coupe have standard driver and passenger frontal airbags, front and rear side-impact airbags, driver and front passenger 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 and rearview cameras.

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 G-Class’ 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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The G-Class has more powerful engines than the Cayenne Coupe:

Horsepower

Torque

G 550 4.0 turbo V8

416 HP

450 lbs.-ft.

AMG G 63 4.0 turbo V8

577 HP

627 lbs.-ft.

Cayenne Coupe 3.0 turbo V6

335 HP

332 lbs.-ft.

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.

Fuel Economy and Range

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An engine control system that can shut down some of the engine’s cylinders helps improve the G-Class’ fuel efficiency. The Cayenne Coupe doesn’t offer a system that can shut down part of the engine.

The G-Class has 6.6 gallons more fuel capacity than the Cayenne Coupe E-Hybrid’s standard fuel tank (26.4 vs. 19.8 gallons), for longer range between fill-ups. The G-Class has 2.7 gallons more fuel capacity than the Cayenne Coupe’s standard fuel tank (26.4 vs. 23.7 gallons).

Transmission

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

Brakes and Stopping

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In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The G-Class 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.

Tires and Wheels

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For better traction, the G-Class’ optional tires are larger than the largest tires available on the Cayenne Coupe (295/40R22 vs. 285/40R21).

The G-Class has a standard full size spare tire so a flat doesn’t interrupt your trip. A full size spare isn’t available on the Cayenne Coupe; it requires you to depend on a temporary spare, which has mileage and speed limitations, or roadside assistance and a tow-truck.

Suspension and Handling

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The G-Class’ front to rear weight distribution is more even (53% to 47%) than the Cayenne Coupe’s (55.9% to 44.1%). This gives the G-Class more stable handling and braking.

For greater off-road capability the G-Class has a 1.3 inches greater minimum ground clearance than the Cayenne Coupe (9.5 vs. 8.2 inches), allowing the G-Class to travel over rougher terrain without being stopped or damaged.

Chassis

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The G 550 is 4.5 inches shorter than the Cayenne Coupe, making the G-Class easier to handle, maneuver and park in tight spaces.

Cargo Capacity

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The G-Class has a much larger cargo volume with its rear seat up than the Cayenne Coupe with its rear seat up (38.1 vs. 22 cubic feet). The G-Class has a much larger cargo volume with its rear seat folded than the Cayenne Coupe with its rear seat folded (68.6 vs. 54.3 cubic feet).

Ergonomics

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The G-Class 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 G-Class’ 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 G-Class 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.

To improve rear visibility by keeping the rear window clear, the G-Class has a standard rear wiper. The Cayenne Coupe doesn’t offer a rear wiper.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes G-Class has a standard wireless phone charging system (Qi) in the center console. The Cayenne Coupe doesn’t offer wireless personal charging.

The G-Class has a 115-volt a/c outlet in the cargo area, 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 G-Class’ Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The Cayenne Coupe doesn’t offer an automated parking system.

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 2020/02/24

The G-Class was chosen as one of Automobile Magazine’s “All Stars” in 2019. The Cayenne Coupe has never been an “All Star.”

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