2019 Mercedes E-Class Sedan vs. 2019 Infiniti Q70

Detailed Review, Specifications & Comparison

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Safety

For enhanced safety, the front and rear seat shoulder belts of the Mercedes E-Class Sedan have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision. The Infiniti Q70 doesn’t offer pretensioners for the rear seat belts.

The rear seatbelts optional on the E-Class Sedan inflate when a collision is detected, helping to spread crash forces over a much larger area of the body and limiting head and neck movement. This can help prevent spinal and internal injuries. The Q70 doesn’t offer inflatable seatbelts.

The E-Class Sedan’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 Q70 doesn’t offer a driver alert monitor.

Both the E-Class Sedan and the Q70 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available all wheel drive, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

For its top level performance in IIHS driver-side small overlap frontal, moderate overlap frontal, side impact, rear impact and roof-crush tests, its standard front crash prevention system, its “Good” rating in the new passenger-side small overlap crash test, and its headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the E-Class Sedan its highest rating: “Top Pick Plus” for 2018, a rating granted to only 28 vehicles tested by the IIHS. The Q70 was last qualified as only a “Top Pick” in 2017.

Warranty

There are over 79 percent more Mercedes dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the E-Class Sedan’s warranty.

Reliability

To reliably power the ignition and other systems and to recharge the battery, the E-Class Sedan has a standard 180-amp alternator. The Q70’s standard 130-amp alternator and largest (optional) 150-amp alternator aren’t as powerful.

Engine

The AMG E 53 Sedan’s 3.0 turbo 6 cyl. hybrid produces 9 more horsepower (429 vs. 420) than the Q70 5.6 LUXE’s optional 5.6 DOHC V8.

Fuel Economy and Range

On the EPA test cycle the AMG E 53 Sedan gets better fuel mileage than the Q70 3.7 LUXE AWD (21 city/28 hwy vs. 18 city/24 hwy).

On the EPA test cycle the E-Class Sedan gets better fuel mileage than the Q70:

 

 

E-Class

Q70

 

RWD

300/Auto

22 city/30 hwy

18 city/25 hwy

V6/Auto

 

 

n/a

16 city/24 hwy

V8/Auto

AWD

300/Auto

21 city/29 hwy

18 city/24 hwy

V6/Auto

 

450/Auto

20 city/28 hwy

16 city/23 hwy

V8/Auto

Regenerative brakes improve the E-Class Sedan 53 AMG’s fuel efficiency by converting inertia back into energy instead of wasting it. The Q70 doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the E-Class Sedan’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 Q70 doesn’t offer an automatic engine start/stop system.

The E-Class Sedan 450/AMG 53’s standard fuel tank has 1.1 gallons more fuel capacity than the Q70 (21.1 vs. 20 gallons).

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes E-Class Sedan higher (5 out of 10) than the Infiniti Q70 (3). This means the E-Class Sedan produces up to 16.5 pounds less smog-producing pollutants than the Q70 every 15,000 miles.

Transmission

A nine-speed automatic is standard on the Mercedes E-Class Sedan, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q70.

Brakes and Stopping

For better stopping power the E-Class Sedan’s front brake rotors are larger than those on the Q70:

 

E-Class Sedan

AMG E 53 Sedan

Q70

Q70 Sport

Front Rotors

13.5 inches

14.6 inches

12.6 inches

14 inches

Rear Rotors

11.8 inches

14.2 inches

12.1 inches

13.8 inches

The E-Class Sedan stops much shorter than the Q70:

 

E-Class Sedan

Q70

 

70 to 0 MPH

154 feet

171 feet

Car and Driver

60 to 0 MPH

106 feet

116 feet

Motor Trend

Tires and Wheels

The E-Class Sedan’s standard tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the Q70’s standard 50 series tires. The E-Class Sedan’s optional 275/35R19 rear tires have a lower 35 series profile than the Q70’s optional 40 series tires.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the E-Class Sedan can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Q70 doesn’t offer run-flat tires.

Suspension and Handling

The E-Class Sedan has standard front and rear gas-charged shocks for better control over choppy roads. The Q70’s suspension doesn’t offer gas-charged shocks.

The E-Class Sedan offers an optional 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 Q70’s suspension doesn’t offer adjustable shock absorbers.

The E-Class Sedan 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 Sedan’s 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 Q70 doesn’t offer a load leveling suspension.

The E-Class Sedan’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 Q70 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the E-Class Sedan’s wheelbase is 1.5 inches longer than on the Q70 (115.7 inches vs. 114.2 inches).

For better handling and stability, the average track (width between the wheels) on the E-Class Sedan is 1.4 inches wider in the front and 1.4 inches wider in the rear than the average track on the Q70.

The E-Class Sedan 4MATIC handles at .92 G’s, while the Q70 3.7 LUXE pulls only .82 G’s of cornering force in a Car and Driver skidpad test.

The E-Class Sedan 4MATIC executes Motor Trend’s “Figure Eight” maneuver 1.6 seconds quicker than the Q70 5.6 LUXE AWD (25.1 seconds @ .77 average G’s vs. 26.7 seconds @ .67 average G’s).

Chassis

As tested by Car and Driver, the interior of the E 300 Sedan 4MATIC is quieter than the Q70 3.7 LUXE:

 

E-Class Sedan

Q70

At idle

38 dB

39 dB

Full-Throttle

76 dB

77 dB

70 MPH Cruising

67 dB

73 dB

Passenger Space

The E-Class Sedan has .5 inches more rear headroom and .4 inches more rear shoulder room than the Q70.

Cargo Capacity

A low lift-over trunk design makes loading and unloading the E-Class Sedan easier. The E-Class Sedan’s trunk lift-over height is 27.7 inches, while the Q70’s liftover is 29.1 inches.

The E-Class Sedan’s standard rear seats fold to accommodate long and bulky cargo. The Q70 doesn’t offer folding rear seats, only a ski pass-through.

To make loading and unloading groceries and cargo easier when your hands are full, the E-Class Sedan’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The Q70 doesn’t offer a power or hands-free opening trunk.

Servicing Ease

The E-Class Sedan has a maintenance free battery for long life without checking the battery’s water level. The Q70 doesn’t have a maintenance free battery, so the water level in the battery’s cells must be checked often to prevent damage.

Ergonomics

The E-Class Sedan 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 Q70 doesn’t offer a remote starting system.

Unlike the driver-only memory system in the Q70, the E-Class Sedan 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 Sedan 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 Q70 doesn’t offer a heads-up display.

The power windows standard on both the E-Class Sedan and the Q70 have locks to prevent small children from operating them. When the lock on the E-Class Sedan is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Q70 prevents the driver from operating the other windows just as it does the other passengers.

The E-Class Sedan’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Q70’s rear power window switches have to be held the entire time to open or close them fully.

Heated windshield washer fluid is standard on the E-Class Sedan to defrost the washer nozzles and quickly clear ice and frost from the windshield without scraping. The Q70 doesn’t offer heated windshield washer fluid.

The Insurance Institute for Highway Safety (IIHS) conducts detailed tests on headlights for their range both straight ahead and in curves and to be certain they don’t exceed acceptable amounts of glare to oncoming drivers. The E-Class Sedan’s headlights were rated “Good” to “Acceptable” by the IIHS, while the Q70’s headlights are rated “Acceptable” to “Marginal.”

While driving with high beams on, sensitive light sensors available for the E-Class Sedan detect other vehicles which could be blinded and automatically switch to low beams. The Q70 doesn’t offer automatic dimming high beams.

To better shield the driver and front passenger’s vision, the E-Class Sedan has standard dual-element sun visors that can block glare from two directions simultaneously. The Q70 doesn’t offer secondary sun visors.

Standard smartphone integration for the E-Class Sedan allows the driver and passengers access to select programs on their smartphones, including reading text messages aloud, playing internet radio stations, finding fuel prices at nearby service stations, searching the internet and other connected activities without taking their eyes off the road or their hands from the wheel. The Q70 doesn’t offer factory integrated smartphone program access.

The E-Class Sedan 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 Q70 doesn’t offer a house-current electrical outlet.

The E-Class Sedan’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 Q70 doesn’t offer an automated parking system.

Model Availability

The Mercedes E-Class comes in coupe, convertible, sedan and station wagon bodystyles; the Infiniti Q70 isn’t available as a coupe, convertible or station wagon.

Economic Advantages

Insurance will cost less for the E-Class Sedan owner. The Complete Car Cost Guide estimates that insurance for the E-Class Sedan will cost $850 less than the Q70 over a five-year period.

Recommendations

Consumer Reports® recommends both the Mercedes E-Class Sedan and the Infiniti Q70, based on reliability, safety and performance.

The E-Class was chosen as one of Car and Driver’s “Top Ten” in 2018. The Q70 has never been a Car and Driver “Top Ten” pick.

The Mercedes E-Class outsold the Infiniti Q70 by almost 10 to one during the 2018 model year.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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