2020 Mercedes AMG C-Class Coupe vs. 2020 Porsche 911

Detailed Review, Specifications & Comparison

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Safety

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For enhanced safety, the front and rear seat shoulder belts of the Mercedes AMG C-Class Coupe have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Porsche 911 doesn’t offer pretensioners for the rear seat belts.

The AMG C-Class Coupe’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The 911 doesn’t offer pre-crash pretensioners.

The AMG C-Class Coupe has standard front and rear seat side-impact airbags and head airbags, which act as a forgiving barrier between the passengers and the door. Combined with high-strength steel door beams this system increases protection from broadside collisions. The 911 doesn't offer rear-seat side-impact airbags, only ones for front seat occupants.

The AMG C-Class Coupe’s blind spot warning system uses digital cameras monitored by computer to alert the driver to moving objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The 911 doesn’t offer a system to reveal objects in the driver’s blind spots.

To help make backing safer, the AMG C-Class Coupe’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The 911 doesn’t offer a cross-path warning system.

The AMG C-Class 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 911 doesn’t offer a driver alert monitor.

Both the AMG C-Class Coupe and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems and around view monitors.

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 C-Class 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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The AMG C-Class Coupe has more powerful engines than the 911:

Horsepower

Torque

AMG C 43 Coupe 3.0 turbo V6

385 HP

384 lbs.-ft.

AMG C 63 Coupe 4.0 turbo V8

469 HP

479 lbs.-ft.

AMG C 63 S Coupe 4.0 turbo V8

503 HP

516 lbs.-ft.

911 3.0 turbo 6-cylinder

379 HP

331 lbs.-ft.

911 S 3.0 turbo 6-cylinder

443 HP

390 lbs.-ft.

Fuel Economy and Range

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On the EPA test cycle the AMG C 43 Coupe 4MATIC gets better fuel mileage than the 911 S Coupe 4 Auto 3.0 twin-turbo 6 cyl. (443 HP) (19 city/27 hwy vs. 18 city/23 hwy).

Transmission

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The Mercedes AMG C-Class Coupe comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the 911.

A nine-speed automatic (SMG) is standard on the Mercedes AMG C-Class Coupe, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the 911.

Brakes and Stopping

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For better stopping power the AMG C-Class Coupe’s standard front brake rotors are larger than those on the 911:

AMG C-Class Coupe

911

Front Rotors

14.2 inches

13 inches

Tires and Wheels

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For better traction, the AMG C-Class Coupe’s front tires are larger than the largest tires available on the 911 (255/40R18 vs. 245/35R20).

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG C-Class Coupe can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The 911 doesn’t offer run-flat tires.

Suspension and Handling

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The AMG C-Class 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 911 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the AMG C-Class Coupe’s wheelbase is 15.3 inches longer than on the 911 (111.8 inches vs. 96.5 inches).

For better handling and stability, the average track (width between the wheels) on the AMG C-Class Coupe is 1.1 inches wider in the front and .8 inches wider in the rear than the average track on the 911.

Passenger Space

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Because it has more passenger and cargo room, the EPA rates the AMG C-Class Coupe a Subcompact car, while the 911 Coupe is rated a Minicompact.

The AMG C-Class Coupe has 6.3 cubic feet more passenger volume than the 911 (79.3 vs. 73).

The AMG C-Class Coupe has .9 inches more front headroom, 2.2 inches more front shoulder room, 3.1 inches more rear headroom, 4.8 inches more rear legroom and 3.8 inches more rear shoulder room than the 911.

Cargo Capacity

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The AMG C-Class Coupe has a much larger trunk than the 911 Coupe with its rear seat up (10.5 vs. 4.6 cubic feet).

With its coupe body style, valet key, locking rear seatbacks and remote trunk release lockout, the AMG C-Class offers cargo security. The 911’s non-lockable folding seat defeats cargo security.

To make loading and unloading groceries and cargo easier when your hands are full, the AMG C-Class Coupe’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The 911 doesn’t offer a power or hands-free opening trunk.

Ergonomics

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The AMG C-Class 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 911 doesn’t offer a remote starting system.

Unlike the driver-only memory system optional at extra cost in the 911, the AMG C-Class Coupe has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The AMG C-Class 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 911.

The AMG C-Class Coupe offers an optional heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The 911 doesn’t offer a heads-up display.

If the windows are left open on the AMG C-Class Coupe 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 911 can only operate the windows from inside the vehicle, with the ignition on.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the AMG C-Class Coupe has standard extendable sun visors. The 911 doesn’t offer extendable visors.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes AMG C-Class offers an optional wireless phone charging system (Qi) in the center console. The 911 doesn’t offer wireless personal charging.

The AMG C-Class Coupe’s optional Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The 911 doesn’t offer an automated parking system.

Model Availability

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The Mercedes AMG C-Class comes in coupe, convertible and sedan bodystyles; the Porsche 911 isn’t available as a sedan.

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 2020/09/25

Consumer Reports® recommends the Mercedes AMG C-Class Coupe, based on reliability, safety and performance.

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