2020 Mercedes AMG GT vs. 2019 Porsche 911

Detailed Review, Specifications & Comparison

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Safety

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The Mercedes AMG GT’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 Mercedes AMG GT’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 Mercedes AMG GT’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 Mercedes AMG GT and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras and available blind spot warning systems.

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 GT’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 Mercedes AMG GT has more powerful engines than the 911:

Horsepower

Torque

Mercedes AMG GT 4.0 turbo V8

469 HP

465 lbs.-ft.

Mercedes AMG GT C 4.0 turbo V8

550 HP

502 lbs.-ft.

Mercedes AMG GT R 4.0 turbo V8

577 HP

516 lbs.-ft.

911 3.0 turbo 6 cyl.

370 HP

331 lbs.-ft.

911 S 3.0 turbo 6 cyl.

420 HP

368 lbs.-ft.

911 GTS 3.0 turbo 6 cyl.

450 HP

405 lbs.-ft.

911 GT3 4.0 DOHC 6 cyl.

500 HP

339 lbs.-ft.

911 GT3 RS 4.0 DOHC 6 cyl.

520 HP

346 lbs.-ft.

911 Turbo 3.8 turbo 6 cyl.

540 HP

523 lbs.-ft.

In a Road and Track race course test, the Mercedes AMG GT R Coupe was clocked 4.14 seconds faster than the Porsche 911 GT3 (88.25 sec. vs. 92.39 sec.).

Fuel Economy and Range

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The Mercedes AMG GT has 2.9 gallons more fuel capacity than the 911 RWD’s standard fuel tank (19.8 vs. 16.9 gallons), for longer range between fill-ups.

Environmental Friendliness

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In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes AMG GT higher (3 out of 10) than the Porsche 911 (1). This means the Mercedes AMG GT produces up to 22.5 pounds less smog-producing pollutants than the 911 every 15,000 miles.

Transmission

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

Brakes and Stopping

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For better stopping power the Mercedes AMG GT’s standard brake rotors are larger than those on the 911:

AMG GT

911

Front Rotors

14.2 inches

13 inches

Rear Rotors

14.2 inches

13 inches

The Mercedes AMG GT stops much shorter than the 911:

Mercedes AMG GT

911

70 to 0 MPH

141 feet

147 feet

Car and Driver

60 to 0 MPH

95 feet

98 feet

Motor Trend

Tires and Wheels

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For better traction, the Mercedes AMG GT has larger front standard tires than the 911 (F:255/35R19 & R:295/30R19 vs. F:235/40R19 & R:295/35R19). The Mercedes AMG GT R Coupe’s front tires are larger than the largest tires available on the 911 (F:275/35R19 & R:325/30R20 vs. F:265/35R20 & R:325/30R21).

The Mercedes AMG GT’s 255/35R19 front and 295/30R19 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the 911’s standard 40 series front and 35 series rear tires.

Suspension and Handling

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For a smoother ride and more stable handling, the Mercedes AMG GT’s wheelbase is 7 inches longer than on the 911 (103.5 inches vs. 96.5 inches). The Mercedes AMG GT’s wheelbase is 6.8 inches longer than on the 911 GT3 (103.5 inches vs. 96.7 inches).

For better handling and stability, the average track (width between the wheels) on the Mercedes AMG GT is 5.2 inches wider in the front and 4.6 inches wider in the rear than the average track on the 911.

The Mercedes AMG GT’s front to rear weight distribution is more even (47% to 53%) than the 911’s (40.1% to 59.9%). This gives the Mercedes AMG GT more stable handling and braking.

The Mercedes AMG GT R Coupe handles at 1.14 G’s, while the 911 Coupe pulls only 1.00 G’s of cornering force in a Road and Track skidpad test.

The Mercedes AMG GT C Roadster handles at 1.00 G’s, while the 911 S Cabriolet pulls only .99 G’s of cornering force in a Road and Track skidpad test.

The Mercedes AMG GT R Coupe executes Motor Trend’s “Figure Eight” maneuver quicker than the 911 Coupe (22.8 seconds @ .96 average G’s vs. 23.5 seconds @ .86 average G’s).

Chassis

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To almost totally eliminate engine vibration in the passenger area, the Mercedes AMG GT has an electronically controlled liquid-filled main engine mount. A computer-controlled electric current in the liquid changes its viscosity, allowing the mount to dampen the engine completely at all RPMs. The 911 uses conventional solid rubber engine mounts.

As tested by Car and Driver, the interior of the Mercedes AMG GT C Coupe is quieter than the 911 GT2 RS:

AMG GT

911

At idle

58 dB

68 dB

Full-Throttle

93 dB

95 dB

70 MPH Cruising

76 dB

79 dB

Passenger Space

© 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 Mercedes AMG GT Coupe has 1.5 inches more front headroom and 7.6 inches more front shoulder room than the 911 Coupe.

Cargo Capacity

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The Mercedes AMG GT Coupe has a much larger trunk than the 911 Coupe with its rear seat up (10.1 vs. 5.1 cubic feet). The Mercedes AMG GT has a much larger trunk with its rear seat folded than the 911 Coupe with its rear seat folded (10.1 vs. 9.1 cubic feet).

The Mercedes AMG GT Roadster has a larger trunk with its top down than the 911 Cabriolet (5.8 vs. 5.1 cubic feet).

With its convertible body style, valet key and remote trunk release lockout, the Mercedes AMG GT 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 Mercedes AMG GT’s available trunk can be opened 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 Mercedes AMG GT offers a 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 Mercedes AMG GT 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 Mercedes AMG GT’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.

If the windows are left open on the Mercedes AMG GT 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 Mercedes AMG GT 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.

The Mercedes AMG GT’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, the Mercedes AMG GT offers optional extendable sun visors. The 911 doesn’t offer extendable visors.

Economic Advantages

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Insurance will cost less for the Mercedes AMG GT owner. The Complete Car Cost Guide estimates that insurance for the Mercedes AMG GT will cost $1670 to $4150 less than the 911 over a five-year period.

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

Road and Track performed a comparison test in its October 2017 issue and the Mercedes AMG GT C Roadster won out over the Porsche 911 GTS Cabriolet.

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