2020 Mercedes AMG E-Class Cabriolet 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 AMG E-Class Cabriolet 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 E-Class Cabriolet’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 E-Class Cabriolet 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.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the AMG E-Class Cabriolet. But it costs extra on the 911.

The AMG E-Class Cabriolet’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 AMG E-Class Cabriolet 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 AMG E-Class Cabriolet’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 E-Class Cabriolet’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 E-Class Cabriolet and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights and rearview cameras.

The Mercedes AMG E-Class Cabriolet weighs 884 to 1450 pounds more than the Porsche 911. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.

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 E-Class Cabriolet’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 E-Class Cabriolet’s 3.0 turbo 6 cyl. hybrid produces 59 more horsepower (429 vs. 370) and 53 lbs.-ft. more torque (384 vs. 331) than the 911’s standard 3.0 turbo 6 cyl. The AMG E-Class Cabriolet’s 3.0 turbo 6 cyl. hybrid produces 9 more horsepower (429 vs. 420) and 16 lbs.-ft. more torque (384 vs. 368) than the 911 S’ standard 3.0 turbo 6 cyl.

Environmental Friendliness

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In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes AMG E-Class Cabriolet higher (5 out of 10) than the Porsche 911 (1). This means the AMG E-Class Cabriolet produces up to 39 pounds less smog-producing pollutants than the 911 every 15,000 miles.

Transmission

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A nine-speed automatic is standard on the Mercedes AMG E-Class Cabriolet, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the 911.

To facilitate fast shifting and allow the driver to focus on the road, the AMG E-Class Cabriolet offers an optional up-shift light to indicate when the engine is approaching redline. The 911 doesn’t offer an up-shift light.

Brakes and Stopping

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

AMG E-Class Cabriolet

911

Front Rotors

14.6 inches

13 inches

Rear Rotors

14.2 inches

13 inches

Tires and Wheels

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For better traction, the AMG E-Class Cabriolet has larger front tires than the 911 (245/40R19 vs. 235/40R19).

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG E-Class Cabriolet 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 front and rear suspension of the AMG E-Class Cabriolet uses air springs for a smoother, controlled ride than the 911, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

The AMG E-Class Cabriolet’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 E-Class Cabriolet’s wheelbase is 16.6 inches longer than on the 911 (113.1 inches vs. 96.5 inches).

For better handling and stability, the track (width between the wheels) on the AMG E-Class Cabriolet is 3 inches wider in the front and 1.6 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 E-Class Cabriolet a Subcompact car, while the 911 Cabriolet is rated a Minicompact.

The AMG E-Class Cabriolet has 19 cubic feet more passenger volume than the 911 Cabriolet (87 vs. 68).

Cargo Capacity

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The AMG E-Class Cabriolet has a much larger trunk with its top down than the 911 Cabriolet (9.5 vs. 5.1 cubic feet).

With its convertible body style, valet key, locking rear seatbacks and remote trunk release lockout, the AMG E-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 AMG E-Class Cabriolet’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 AMG E-Class Cabriolet 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 E-Class Cabriolet 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 E-Class Cabriolet’s 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 911.

The AMG E-Class Cabriolet 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.

The AMG E-Class Cabriolet’s standard power windows have a locking feature to keep children in the rear seat from operating them, but the driver can still raise and lower all of them with the lock engaged. Porsche does not offer a locking feature on the 911’s power windows.

If the windows are left open on the AMG E-Class Cabriolet 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.

In case of a sudden change of weather, the AMG E-Class Cabriolet has a standard remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. The 911 doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

Keyless-Go standard on the AMG E-Class Cabriolet 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 AMG E-Class Cabriolet’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.

Heated windshield washer fluid is standard on the AMG E-Class Cabriolet to defrost the washer nozzles and quickly clear ice and frost from the windshield without scraping. The 911 doesn’t offer heated windshield washer fluid.

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

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

The AMG E-Class Cabriolet’s optional Active Parking Assist can parallel park 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 E-Class comes in coupe, convertible, sedan and station wagon bodystyles; the Porsche 911 isn’t available as a sedan or station wagon.

Economic Advantages

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Insurance will cost less for the AMG E-Class Cabriolet owner. The Complete Car Cost Guide estimates that insurance for the AMG E-Class Cabriolet will cost $6305 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 AMG E-Class Cabriolet will be $50133 less than for the Porsche 911.

Recommendations

© 1999 - 2019 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 2019/11/17

The E 450/E 53 was chosen as one of Car and Driver’s “Top Ten” for 2 of the last 2 years. The 911 has never been a Car and Driver “Top Ten” pick.

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