Certified Benz & Beemer Compares 2015 Porsche 911 VS 2015 Mercedes C63 Near Phoenix, AZ

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2015 Porsche 911

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2015 Mercedes C63

Safety Comparison

The 911 offers all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The C63 Coupe doesn’t offer all-wheel drive.

Both the 911 and the C63 Coupe 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

The 911’s corrosion warranty is 6 years and unlimited miles longer than the C63 Coupe’s (10/unlimited vs. 4/50,000).

Reliability Comparison

The battery on the 911 is in the trunk, which protects it from hot underhood temperatures which can degrade battery life. By keeping the 911’s battery 20 to 30 degrees cooler, its life is increased by years. The C63 Coupe’s battery is in the hot engine compartment.

J.D. Power and Associates rated the 911 first among midsize premium sporty cars in their 2013 Initial Quality Study. The C63 Coupe 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

The 911 Turbo S’ 3.8 turbo 6 cyl. produces 53 more horsepower (560 vs. 507) and 59 lbs.-ft. more torque (516 vs. 457) than the C63 Coupe 507 Edition’s optional 6.2 DOHC V8.

As tested in Car and Driver the 911 S is faster than the C63 Coupe 507 Edition (automatics tested):


C63 Coupe

Zero to 60 MPH

3.6 sec

3.9 sec

Zero to 100 MPH

8.6 sec

9.2 sec

5 to 60 MPH Rolling Start

4.4 sec

4.6 sec

Quarter Mile

12 sec

12.3 sec

Speed in 1/4 Mile

118 MPH

117 MPH

Top Speed

188 MPH

176 MPH

The flat cylinder configuration of the boxer engine in the 911 lowers its center of gravity, enhancing handling stability. The C63 Coupe doesn’t offer a boxer engine configuration.

Fuel Economy and Range Comparison

On the EPA test cycle the 911 Coupe gets better fuel mileage than the C63 Coupe:


C63 Coupe



19 city/27 hwy



19 city/27 hwy



20 city/28 hwy

13 city/19 hwy


19 city/27 hwy



15 city/20 hwy




19 city/27 hwy



18 city/26 hwy



20 city/28 hwy



19 city/26 hwy



17 city/24 hwy


Turbo S/Auto

17 city/24 hwy


Regenerative brakes improve the 911’s fuel efficiency by converting inertia back into energy instead of wasting it. The C63 Coupe doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the 911 (except GT3)’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The C63 Coupe doesn’t offer an automatic engine start/stop system.

The 911 GT3’s optional fuel tank has 6.3 gallons more fuel capacity than the C63 Coupe (23.7 vs. 17.4 gallons).

Brakes and Stopping Comparison

For better stopping power the 911 Turbo/GT3’s brake rotors are larger than those on the C63 Coupe:

911 Turbo/GT3

911 Turbo/GT3 opt.

C63 Coupe

Front Rotors

15 inches

16.1 inches

14.2 inches

Rear Rotors

15 inches

15.4 inches

13 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 C63 Coupe doesn’t offer ceramic brake rotors.

The 911 stops much shorter than the C63 Coupe:


C63 Coupe

70 to 0 MPH

135 feet

161 feet

Car and Driver

60 to 0 MPH

93 feet

103 feet

Motor Trend

Tires and Wheels Comparison

For better traction, the 911’s optional tires are larger than the largest tires available on the C63 Coupe (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 C63 Coupe. The 911’s optional 20-inch wheels are larger than the 19-inch wheels optional on the C63 Coupe.

Suspension and Handling Comparison

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 C63 Coupe doesn’t offer an active sway bar system.

The 911 GT3 Coupe handles at 1.12 G’s, while the C63 Coupe pulls only .90 G’s of cornering force in a Car and Driver skidpad test.

The 911 Turbo S Coupe executes Motor Trend’s “Figure Eight” maneuver 2.2 seconds quicker than the C63 Coupe (23 seconds @ .93 average G’s vs. 25.2 seconds @ .78 average G’s).

For better maneuverability, the 911 Turbo/GT3’s turning circle is 1.6 feet tighter than the C63 Coupe’s (34.8 feet vs. 36.4 feet).

Chassis Comparison

The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 300 to 750 pounds less than the Mercedes C63 Coupe.

The 911 is 8.5 inches shorter than the C63 Coupe, making the 911 easier to handle, maneuver and park in tight spaces.

Passenger Space Comparison

The 911 Coupe has 1 inch more front headroom and 4.1 inches more front legroom than the C63 Coupe.

Ergonomics Comparison

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 C63 Coupe 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 C63 Coupe doesn’t offer heated windshield washer nozzles.

To improve rear visibility by keeping the rear window clear, the 911 offers an optional rear wiper. The C63 Coupe doesn’t offer a rear wiper.

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 C63 Coupe doesn’t offer headlight washers.

The 911’s optional air conditioned front seats cool the driver and front passenger and help take the sting out of hot leather in Summer. The C63 Coupe doesn’t offer air conditioned front seats.

On extremely cold Winter days, the 911’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The C63 Coupe doesn’t offer a heated steering wheel.

Recommendations Comparison

Motor Trend performed a comparison test in its November 2012 issue and the Porsche 911 S Coupe won out over the Mercedes C63 Coupe.

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 C63 Coupe isn’t in the top three.

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