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The AMG CLS’ pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Giulia Quadrifoglio doesn’t offer pre-crash pretensioners.
For enhanced safety, the front seat shoulder belts of the Mercedes AMG CLS are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Alfa Romeo Giulia Quadrifoglio doesn’t offer height-adjustable seat belts.
The AMG CLS has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The Giulia Quadrifoglio doesn’t offer all-wheel drive.
The AMG CLS offers an optional Surround View Camera to allow the driver to see objects all around the vehicle on a screen. The Giulia Quadrifoglio 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.
Both the AMG CLS and the Giulia Quadrifoglio have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, blind spot warning systems, rearview cameras, rear cross-path warning and available lane departure warning systems.
The Mercedes AMG CLS weighs 627 pounds more than the Alfa Romeo Giulia Quadrifoglio. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The AMG CLS’ corrosion warranty is 1 year longer than the Giulia Quadrifoglio’s (5 vs. 4 years).
There are over 2 times as many Mercedes dealers as there are Alfa Romeo dealers, which makes it much easier should you ever need service under the AMG CLS’ warranty.
J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Alfa Romeo vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 24 more problems per 100 vehicles, Alfa Romeo is ranked 29th.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Mercedes vehicles are more reliable than Alfa Romeo vehicles. Consumer Reports ranks Mercedes 8 places higher in reliability than Alfa Romeo.
On the EPA test cycle the AMG CLS 53 gets better fuel mileage than the Giulia Quadrifoglio (21 city/27 hwy vs. 17 city/25 hwy).
Regenerative brakes improve the AMG CLS’ fuel efficiency by converting inertia back into energy instead of wasting it. The Giulia Quadrifoglio doesn’t offer a regenerative braking system.
The AMG CLS has 5.8 gallons more fuel capacity than the Giulia Quadrifoglio (21.1 vs. 15.3 gallons), for longer range between fill-ups.
In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes AMG CLS higher (6 out of 10) than the Alfa Romeo Giulia Quadrifoglio (3). This means the AMG CLS produces up to 23.4 pounds less smog-producing pollutants than the Giulia Quadrifoglio every 15,000 miles.
A nine-speed automatic is standard on the Mercedes AMG CLS, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the Giulia Quadrifoglio.
For better stopping power the AMG CLS’ standard brake rotors are larger than those standard on the Giulia Quadrifoglio:
For better ride, handling and brake cooling the AMG CLS offers optional 20-inch front wheels. The Giulia Quadrifoglio’s largest wheels are only 19-inches.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG CLS can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Giulia Quadrifoglio doesn’t offer run-flat tires.
The front and rear suspension of the AMG CLS uses air springs for a smoother, controlled ride than the Giulia Quadrifoglio, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The AMG CLS has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The AMG CLS’ height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The Giulia Quadrifoglio doesn’t offer a load leveling suspension.
The AMG CLS’ 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 Giulia Quadrifoglio doesn’t offer drift compensation steering.
For a smoother ride and more stable handling, the AMG CLS’ wheelbase is 4.7 inches longer than on the Giulia Quadrifoglio (115.7 inches vs. 111 inches).
For better handling and stability, the track (width between the wheels) on the AMG CLS is 3.6 inches wider in the front and 1.2 inches wider in the rear than on the Giulia Quadrifoglio.
The design of the Mercedes AMG CLS amounts to more than styling. The AMG CLS has an aerodynamic coefficient of drag of .26 Cd. That is significantly lower than the Giulia Quadrifoglio (.31) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the AMG CLS get better fuel mileage.
The AMG CLS has 1.7 inches more front shoulder room and 2.9 inches more rear shoulder room than the Giulia Quadrifoglio.
With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the AMG CLS offers cargo security. The Giulia Quadrifoglio’s non-lockable remote release defeats cargo security.
To make loading and unloading groceries and cargo easier when your hands are full, the AMG CLS’ power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The Giulia Quadrifoglio doesn’t offer a power or hands-free opening trunk.
Unlike the driver-only memory seat and mirrors in the Giulia Quadrifoglio, the AMG CLS 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 AMG CLS offers an optional heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Giulia Quadrifoglio doesn’t offer a heads-up display.
If the windows are left open on the AMG CLS 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 Giulia Quadrifoglio can only operate the windows from inside the vehicle, with the ignition on.
Keyless-Go standard on the AMG CLS allows you to unlock the doors, trunk and start the engine all without removing a key from pocket or purse. This eliminates searching for keys before loading groceries, getting in the vehicle in bad weather or making a hurried start to your trip. The Alfa Romeo Giulia Quadrifoglio’s Keyless-Go doesn’t unlock the trunk.
Heated windshield washer fluid is standard on the AMG CLS to defrost the washer nozzles and quickly clear ice and frost from the windshield without scraping. The Giulia Quadrifoglio 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 optional in the AMG CLS to help block heat and glare for the rear passengers. The Giulia Quadrifoglio doesn’t offer a rear sunshade.
When the AMG CLS is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The Giulia Quadrifoglio’s mirror doesn’t automatically adjust for backing.
Optional air-conditioned seats in the AMG CLS keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The Giulia Quadrifoglio doesn’t offer air-conditioned seats.
The AMG CLS offers optional massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the Giulia Quadrifoglio.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes AMG CLS has a standard wireless phone charging system (Qi) in the center console. Wireless charging costs extra on the Giulia Quadrifoglio.
The AMG CLS offers an optional 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 Giulia Quadrifoglio doesn’t offer a house-current electrical outlet.
The AMG CLS’ Active Parking Assist can parallel park by itself, starting, stopping and changing direction automatically. The Giulia Quadrifoglio doesn’t offer an automated parking system.
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