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For enhanced safety, the front and rear seat shoulder belts of the Mercedes 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 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 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.
The 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 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 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 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 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, rearview cameras, available all wheel drive and blind spot warning systems.
The Mercedes E-Class Cabriolet weighs 507 to 1216 pounds more than the Porsche 911. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
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 E-Class Cabriolet’s warranty.
The Mercedes E-Class Cabriolet 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 E-Class Cabriolet, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the 911.
For better stopping power the E-Class Cabriolet’s standard brake rotors are larger than those on the 911:
For better traction, the E-Class Cabriolet has larger standard tires than the 911 (245/45R18 vs. 235/40R19).
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the 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.
The 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 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 average track (width between the wheels) on the E-Class Cabriolet is 2.6 inches wider in the front and 1.9 inches wider in the rear than the average track on the 911.
The 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 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 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.
The 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 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 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 E-Class Cabriolet 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.
The E-Class Cabriolet’s standard power windows have a locking feature to keep children in the rear seat from operating them. Porsche does not offer a locking feature on the 911’s standard power windows.
If the windows are left open on the 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 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.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the E-Class Cabriolet has standard extendable sun visors. The 911 doesn’t offer extendable visors.
For greater rear passenger comfort, the E-Class Cabriolet has standard rear a/c vents to keep rear occupants more comfortable. The 911 doesn’t offer rear vents.
The E-Class Cabriolet’s optional Active Parking Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The 911 doesn’t offer an automated parking system.
The Mercedes E-Class comes in coupe, convertible, sedan and station wagon bodystyles; the Porsche 911 isn’t available as a sedan or station wagon.
Insurance will cost less for the E-Class Cabriolet owner. The Complete Car Cost Guide estimates that insurance for the E-Class Cabriolet will cost $2370 to $9275 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 E-Class Cabriolet will be $12072 to $86387 less than for the Porsche 911.
The E-Class was chosen as one of Car and Driver’s “Top Ten” in 2018. The 911 has never been a Car and Driver “Top Ten” pick.
The Mercedes E-Class outsold the Porsche 911 by almost five to one during the 2018 model year.
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