Certified Benz & Beemer Compares 2015 Porsche 911 VS 2015 Mercedes E-Class Near Scottsdale, AZ

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2015 Porsche 911

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VS

2015 Mercedes E-Class

Safety Comparison

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The 911 offers all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The E-Class Cabriolet doesn’t offer all-wheel drive.

Both the 911 and the E-Class Cabriolet have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, plastic fuel tanks, four-wheel antilock brakes, traction control and electronic stability systems to prevent skidding.

Warranty Comparison

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The 911’s corrosion warranty is 6 years and unlimited miles longer than the E-Class Cabriolet’s (10/unlimited vs. 4/50,000).

Reliability Comparison

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J.D. Power and Associates rated the 911 first among midsize premium sporty cars in their 2013 Initial Quality Study. The E-Class Cabriolet isn’t in the top three in its category.

J.D. Power and Associates’ 2014 Initial Quality Study of new car owners surveyed provide the statistics that show that Porsche vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks Porsche first in initial quality, above the industry average. With 41 more problems per 100 vehicles, Mercedes is ranked 13th.

Engine Comparison

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The 911 has more powerful engines than the E-Class Cabriolet:

Horsepower

Torque

911 3.4 DOHC 6 cyl.

350 HP

287 lbs.-ft.

911 S 3.8 DOHC 6 cyl.

400 HP

325 lbs.-ft.

911 GTS 3.8 DOHC 6 cyl.

430 HP

325 lbs.-ft.

911 GT3 Coupe 3.8 DOHC 6 cyl.

475 HP

325 lbs.-ft.

911 Turbo 3.8 turbo 6 cyl.

520 HP

487 lbs.-ft.

911 Turbo S 3.8 turbo 6 cyl.

560 HP

516 lbs.-ft.

E400 Cabriolet 3.0 turbo V6

329 HP

354 lbs.-ft.

E550 Cabriolet 4.7 turbo V8

402 HP

443 lbs.-ft.

The flat cylinder configuration of the boxer engine in the 911 lowers its center of gravity, enhancing handling stability. The E-Class Cabriolet doesn’t offer a boxer engine configuration.

Fuel Economy and Range Comparison

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On the EPA test cycle the 911 Cabriolet gets better fuel mileage than the E-Class Cabriolet:

911

E-Class Cabriolet

RWD

Base/Manual

19 city/27 hwy

n/a

S/Manual

19 city/27 hwy

n/a

Base/Auto

21 city/28 hwy

n/a

S/Auto

19 city/27 hwy

17 city/26 hwy

E550

AWD

Base/Manual

19 city/26 hwy

n/a

S/Manual

18 city/26 hwy

n/a

Base/Auto

20 city/27 hwy

n/a

S/Auto

19 city/26 hwy

n/a

Regenerative brakes improve the 911’s fuel efficiency by converting inertia back into energy instead of wasting it. The E-Class Cabriolet doesn’t offer a regenerative braking system.

The 911 GT3’s optional fuel tank has 6.3 gallons more fuel capacity than the E-Class Cabriolet (23.7 vs. 17.4 gallons).

Brakes and Stopping Comparison

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

911

911 S

911 Turbo/GT3

911 Turbo/GT3 opt.

E400 Cabriolet

E550 Cabriolet

Front Rotors

13 inches

13.4 inches

16.1 inches

16.1 inches

12.7 inches

14.2 inches

Rear Rotors

13 inches

13 inches

15.4 inches

15.4 inches

11.8 inches

11.8 inches

The 911 offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The E-Class Cabriolet doesn’t offer ceramic brake rotors.

Tires and Wheels Comparison

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For better traction, the 911’s optional tires are larger than the largest tires available on the E-Class Cabriolet (F:245/35R20 & R:305/30R20 vs. F:235/40R18 & R:255/35R18).

For better ride, handling and brake cooling the 911 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the E-Class Cabriolet. The 911’s optional 20-inch wheels are larger than the 19-inch wheels optional on the E-Class Cabriolet.

Suspension and Handling Comparison

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The 911 offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride. This helps keep the tires glued to the road. The E-Class Cabriolet doesn’t offer an active sway bar system.

Chassis Comparison

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The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 850 to 1050 pounds less than the Mercedes E-Class Cabriolet.

The 911 is 8.2 inches shorter than the E-Class Cabriolet, making the 911 easier to handle, maneuver and park in tight spaces.

Cargo Capacity Comparison

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A low lift-over trunk design makes loading and unloading the 911 easier. The 911’s trunk lift-over height is 24.3 inches, while the E-Class Cabriolet’s liftover is 25.9 inches.

The 911’s standard rear seats fold to accommodate long and bulky cargo. The E-Class Cabriolet doesn’t offer folding rear seats, only a ski pass-through.

Ergonomics Comparison

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The 911’s instruments include an oil pressure gauge and a temperature gauge – which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The E-Class Cabriolet does not have an oil pressure gauge.

Heated windshield washer nozzles are standard on the 911 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The E-Class Cabriolet doesn’t offer heated windshield washer nozzles.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The 911 offers available headlight washers to keep headlight output high. The E-Class Cabriolet doesn’t offer headlight washers.

Recommendations Comparison

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

The 911 was chosen as one of Automobile Magazine’s “All Stars” for 6 of the last 19 years. The E Class has never been an “All Star.”

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