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The Dawn has standard PostCrash, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The E-Class Cabriolet doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.
An active infrared night vision system optional on the Dawn helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera and near-infrared lights to detect heat, the system then displays the image on a monitor in the dashboard. The E-Class Cabriolet doesn’t offer a night vision system.
Both the Dawn and the E-Class Cabriolet have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, driver alert monitors and available lane departure warning systems.
The Rolls-Royce Dawn weighs 871 to 1014 pounds more than the Mercedes E-Class Cabriolet. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The Dawn comes with a full 4-year/unlimited-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The E-Class Cabriolet’s 4-year/50,000-mile basic warranty expires sooner.
Rolls-Royce pays for scheduled maintenance on the Dawn for 4 years and unlimited miles. Rolls-Royce will pay for oil changes, lubrication and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the E-Class Cabriolet.
The Dawn’s standard 6.6 turbo V12 produces 234 more horsepower (563 vs. 329) and 251 lbs.-ft. more torque (605 vs. 354) than the E-Class Cabriolet’s 3.0 turbo V6. The Dawn Black Label’s standard 6.6 turbo V12 produces 264 more horsepower (593 vs. 329) and 266 lbs.-ft. more torque (620 vs. 354) than the E-Class Cabriolet’s 3.0 turbo V6.
The Dawn has 4.5 gallons more fuel capacity than the E-Class Cabriolet (21.9 vs. 17.4 gallons), for longer range between fill-ups.
For better stopping power the Dawn’s brake rotors are larger than those on the E-Class Cabriolet:
For better traction, the Dawn has larger tires than the E-Class Cabriolet (F:255/45R20 & R:285/40R20 vs. 245/40R19). The Dawn’s tires are larger than the largest tires available on the E-Class Cabriolet (F:255/45R20 & R:285/40R20 vs. F:245/45R18 & R:275/40R18).
The Dawn’s standard 285/40R20 rear tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the E-Class Cabriolet 4MATIC’s standard 45 series tires.
For better ride, handling and brake cooling the Dawn has standard 20-inch wheels. Smaller 18-inch wheels are standard on the E-Class Cabriolet. The Dawn’s optional 21-inch wheels are larger than the 20-inch wheels optional on the E-Class Cabriolet.
The Dawn has active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The E-Class Cabriolet doesn’t offer an active sway bar system.
The front and rear suspension of the Dawn uses air springs for a smoother, controlled ride than the E-Class Cabriolet, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The Dawn offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Mercedes doesn’t offer an active suspension on the E-Class Cabriolet.
The Dawn has a standard driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The E-Class Cabriolet’s suspension doesn’t offer adjustable shock absorbers.
The Dawn has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The E-Class Cabriolet doesn’t offer a load leveling suspension.
For a smoother ride and more stable handling, the Dawn’s wheelbase is 9.4 inches longer than on the E-Class Cabriolet (122.5 inches vs. 113.1 inches).
For better handling and stability, the track (width between the wheels) on the Dawn is 1.7 inches wider in the front and 1.5 inches wider in the rear than on the E-Class Cabriolet.
The Dawn has 2.9 inches more front shoulder room, .6 inches more rear headroom, 2.9 inches more rear legroom and 6.3 inches more rear shoulder room than the E-Class Cabriolet.
Heated windshield washer nozzles are standard on the Dawn 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 Dawn has standard headlight washers to keep headlight output high. The E-Class Cabriolet doesn’t offer headlight washers.
Both the Dawn and the E-Class Cabriolet have standard heated front seats. The Dawn also has standard heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the E-Class Cabriolet.
The Dawn has a standard center folding armrest for the rear passengers. A center armrest helps make rear passengers more comfortable. The E-Class Cabriolet doesn’t offer a rear seat center armrest.
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