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The S-Class Cabriolet has standard Active Brake Assist, which use forward mounted sensors to warn the driver of a possible collision ahead. If the driver doesn’t react and the system determines a collision is imminent, it automatically applies the brakes at full-force in order to reduce the force of the crash or avoid it altogether. The Dawn doesn't offer collision warning or crash mitigation brakes.
The S-Class Cabriolet’s blind spot warning system uses digital cameras monitored by computer to alert the driver to moving objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The Dawn doesn’t offer a system to reveal objects in the driver’s blind spots.
To help make backing safer, the S-Class Cabriolet’s 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 Dawn doesn’t offer a cross-path warning system.
Both the S-Class Cabriolet and the Dawn have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, around view monitors, driver alert monitors and available night vision systems.
The S-Class Cabriolet’s corrosion warranty is 1 year longer than the Dawn’s (5 vs. 4 years).
There are almost 11 times as many Mercedes dealers as there are Rolls-Royce dealers, which makes it much easier should you ever need service under the S-Class Cabriolet’s warranty.
On the EPA test cycle the S 560 Cabriolet gets better fuel mileage than the Dawn (17 city/26 hwy vs. 12 city/18 hwy).
An engine control system that can shut down some of the engine’s cylinders helps improve the S-Class Cabriolet’s fuel efficiency. The Dawn doesn’t offer a system that can shut down part of the engine.
In heavy traffic or at stoplights the S-Class Cabriolet’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 Dawn doesn’t offer an automatic engine start/stop system.
A nine-speed automatic is standard on the Mercedes S-Class Cabriolet, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the Dawn.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the S-Class Cabriolet can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. Run-flat tires aren’t available on some tire packages on the Dawn.
The S-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 Dawn doesn’t offer drift compensation steering.
The AMG S 63 Cabriolet 4MATIC handles at .89 G’s, while the Dawn pulls only .83 G’s of cornering force in a Car and Driver skidpad test.
For better maneuverability, the S 560 Cabriolet’s turning circle is 3.7 feet tighter than the Dawn’s (38 feet vs. 41.7 feet).
The Mercedes S-Class Cabriolet may be more efficient, handle and accelerate better because it weighs about 400 pounds less than the Rolls-Royce Dawn.
The S-Class Cabriolet is 10 inches shorter than the Dawn, making the S-Class Cabriolet easier to handle, maneuver and park in tight spaces.
For excellent aerodynamics, the S-Class Cabriolet has standard flush composite headlights. The Dawn has recessed headlights that spoil its aerodynamic shape and create extra drag.
As tested by Car and Driver while at idle, the interior of the AMG S 63 Cabriolet 4MATIC is quieter than the Dawn (42 vs. 43 dB).
The S-Class Cabriolet has .2 inches more front legroom and .7 inches more rear headroom than the Dawn.
The S-Class Cabriolet has a much larger trunk with its top up than the Dawn with its top up (12.4 vs. 10.4 cubic feet).
The S-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 Dawn doesn’t offer a remote starting system.
The S-Class Cabriolet’s front and rear power windows all open or close with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside of the car. The Dawn’s rear power window switches have to be held the entire time to close them fully.
Heated windshield washer fluid is standard on the S-Class Cabriolet to defrost the washer nozzles and quickly clear ice and frost from the windshield without scraping. The Dawn doesn’t offer heated windshield washer fluid. Its standard heated washer nozzles will defrost the washer fluid but not the windshield.
A power rear sunshade is standard in the S-Class Cabriolet to help block heat and glare for the rear passengers. The Dawn doesn’t offer a rear sunshade.
On extremely cold winter days, the S-Class Cabriolet’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The Dawn doesn’t offer a heated steering wheel.
The S-Class Cabriolet has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Dawn doesn’t offer a house-current electrical outlet.
The S-Class Cabriolet’s Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The Dawn doesn’t offer an automated parking system.
The Mercedes S-Class comes in coupe, convertible and sedan bodystyles; the Rolls-Royce Dawn isn’t available as a coupe or sedan.
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