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For enhanced safety, the front seat shoulder belts of the Mazda 6 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 doesn’t offer height-adjustable seat belts.
The Mazda 6 has standard Whiplash Reducing Headrests, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Whiplash Reducing Headrests system moves the headrests forward to prevent neck and spine injuries. The Giulia doesn’t offer a whiplash protection system.
The Mazda 6 Signature has a standard 360-degree View Monitor to allow the driver to see objects all around the vehicle on a screen. The Giulia 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.
The Mazda 6 has standard E911 Automatic Emergency Notification, which uses a global positioning satellite (GPS) receiver and a cellular system to send emergency personnel to the scene if any airbags deploy. The Giulia doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.
Both the Mazda 6 and the Giulia have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights and rearview cameras.
For its top level performance in IIHS driver-side small overlap frontal, moderate overlap frontal, side impact, rear impact and roof-crush tests, with its optional front crash prevention system, its “Good” rating in the new passenger-side small overlap crash test, and its available headlight’s “Acceptable” rating, the Insurance Institute for Highway Safety grants the Mazda 6 the rating of “Top Pick” for 2019, a rating granted to only 62 vehicles tested by the IIHS. The Giulia has not been fully tested, yet.
Mazda’s powertrain warranty covers the 6 1 year and 10,000 miles longer than Alfa Romeo covers the Giulia. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 5 years or 60,000 miles. Coverage on the Giulia ends after only 4 years or 50,000 miles.
The Mazda 6’s corrosion warranty is 1 year longer than the Giulia’s (5 vs. 4 years).
There are over 3 times as many Mazda dealers as there are Alfa Romeo dealers, which makes it much easier should you ever need service under the 6’s warranty.
A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the Mazda 6’s reliability 58 points higher than the Giulia.
An engine control system that can shut down half of the engine’s cylinders helps improve the Mazda 6 (except Turbo)’s fuel efficiency. The Giulia doesn’t offer a system that can shut down part of the engine.
The Mazda 6 has 1.1 gallons more fuel capacity than the Giulia (16.4 vs. 15.3 gallons), for longer range between fill-ups.
The Mazda 6 stops much shorter than the Giulia:
70 to 0 MPH
Car and Driver
60 to 0 MPH
60 to 0 MPH (Wet)
The Mazda 6 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the Giulia; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed.
For better handling and stability, the average track (width between the wheels) on the Mazda 6 is 1.3 inches wider in the front than the track on the Giulia.
The Mazda 6 Touring handles at .87 G’s, while the Giulia Ti Q4 pulls only .79 G’s of cornering force in a Car and Driver skidpad test.
For better maneuverability, the Mazda 6’s turning circle is .8 feet tighter than the Giulia’s (36.7 feet vs. 37.5 feet).
The Mazda 6 may be more efficient, handle and accelerate better because it weighs about 100 to 300 pounds less than the Alfa Romeo Giulia.
The Mazda 6 (except Sport) offers available computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The Giulia doesn’t offer active noise cancellation.
As tested by Car and Driver while cruising at 70 MPH, the interior of the Mazda 6 Touring is quieter than the Giulia Ti (67 vs. 69 dB).
The Mazda 6 has 4.3 cubic feet more passenger volume than the Giulia (99.7 vs. 95.4).
The Mazda 6 has 3.6 inches more rear legroom and 1.5 inches more rear shoulder room than the Giulia.
The Mazda 6 has a much larger trunk than the Giulia (14.7 vs. 12 cubic feet).
The Mazda 6 Grand Touring Reserve and Signature have a standard 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 doesn’t offer a heads-up display.
Standard air-conditioned seats in the Mazda 6 Grand Touring Reserve/Signature keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The Giulia doesn’t offer air-conditioned seats.
Consumer Reports® recommends the Mazda 6, based on reliability, safety and performance. The Alfa Romeo Giulia isn't recommended.
The Mazda 6 outsold the Alfa Romeo Giulia by almost three to one during 2018.
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