2020 Mercedes C-Class Coupe vs. 2019 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 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 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 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 C-Class Coupe’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. The 911 doesn’t offer a lane departure warning system.

The C-Class Coupe offers an optional Surround View System to allow the driver to see objects all around the vehicle on a screen. The 911 only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

To help make backing safer, the 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 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 C-Class Coupe and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras and available all wheel drive.

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 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.

Fuel Economy and Range

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On the EPA test cycle the C-Class Coupe gets better fuel mileage than the 911 Coupe:

MPG

C-Class Coupe

RWD

Auto

2.0 turbo 4-cyl.

22 city/31 hwy

AWD

Auto

2.0 turbo 4-cyl.

21 city/30 hwy

911 Coupe

RWD

Manual

3.0 turbo 6-cyl.

20 city/29 hwy

S 3.0 turbo 6-cyl.

20 city/29 hwy

GTS 3.0 turbo 6-cyl.

18 city/26 hwy

GT3 4.0 DOHC 6-cyl.

13 city/21 hwy

Auto

3.0 turbo 6-cyl.

22 city/30 hwy

S 3.0 turbo 6-cyl.

22 city/28 hwy

GTS 3.0 turbo 6-cyl.

20 city/26 hwy

AWD

Auto

3.0 turbo 6-cyl.

22 city/28 hwy

S 3.0 turbo 6-cyl.

21 city/28 hwy

GTS 3.0 turbo 6-cyl.

20 city/26 hwy

Turbo 3.6 turbo 6-cyl.

19 city/24 hwy

Environmental Friendliness

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In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes C-Class Coupe higher (6 out of 10) than the Porsche 911 (1). This means the C-Class Coupe produces up to 45.9 pounds less smog-producing pollutants than the 911 every 15,000 miles.

Transmission

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The Mercedes 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 is standard on the Mercedes C-Class Coupe, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the 911.

Tires and Wheels

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Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the 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.

The C-Class Coupe 300 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the 911, it requires you to depend on roadside assistance and your vehicle will have to be towed.

Suspension and Handling

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The 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 C-Class Coupe’s wheelbase is 15.3 inches longer than on the 911 (111.8 inches vs. 96.5 inches).

The C-Class Coupe’s front to rear weight distribution is more even (53.8% to 46.2%) than the 911’s (40.1% to 59.9%). This gives the C-Class Coupe more stable handling and braking.

Passenger Space

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

The C-Class Coupe has 9.3 cubic feet more passenger volume than the 911 Coupe (79.3 vs. 70).

The C-Class Coupe has .8 inches more front headroom, 4 inches more front shoulder room, 4.6 inches more rear headroom, 7 inches more rear legroom and 3.4 inches more rear shoulder room than the 911 Coupe.

Cargo Capacity

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The C-Class Coupe has a much larger trunk than the 911 Coupe with its rear seat up (10.5 vs. 5.1 cubic feet). The C-Class Coupe has a much larger trunk with its rear seat folded than the 911 Coupe with its rear seat folded (10.5 vs. 9.1 cubic feet).

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

To make loading groceries and cargo easier when your hands are full, the C-Class Coupe’s trunk can be opened and closed just by kicking your foot under the back bumper, leaving your hands completely free. The 911 doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.

Ergonomics

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The 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 C-Class Coupe offers an optional 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 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 C-Class Coupe offers an optional heads-up display that projects speed and navigation instruction 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 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.

Keyless-Go standard on the C-Class Coupe allows you to unlock the driver’s door, trunk and start the engine all without removing a key from pocket or purse. This eliminates searching for keys before loading groceries, getting in the vehicle in bad weather or making a hurried start to your trip. The Porsche 911’s available Porsche Entry and Drive doesn’t unlock the trunk.

The C-Class Coupe’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 911’s cruise control switches are unlit, making them difficult to find at night and operate safely.

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

For greater rear passenger comfort, the C-Class Coupe has standard rear a/c vents to keep rear occupants more comfortable. The 911 doesn’t offer rear vents.

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

Model Availability

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

Economic Advantages

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Insurance will cost less for the C-Class Coupe owner. The Complete Car Cost Guide estimates that insurance for the C-Class Coupe will cost $8565 to $9190 less than the 911 over a five-year period.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Mercedes C-Class Coupe will be $81384 to $83659 less than for the Porsche 911.

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 2020/08/12

Consumer Reports® recommends both the Mercedes C-Class Coupe and the Porsche 911, based on reliability, safety and performance.

J.D. Power and Associates rated the C-Class Coupe first among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The 911 isn’t in the top three in its category.

The Mercedes C-Class outsold the Porsche 911 by over six to one during the 2019 model year.

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