2020 Mercedes GLB vs. 2020 Acura RDX

Detailed Review, Specifications & Comparison

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Safety

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/08/13

For enhanced safety, the front and middle seat shoulder belts of the Mercedes GLB have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision. The Acura RDX doesn’t offer pretensioners for the middle seat belts.

The GLB’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 RDX doesn’t offer a driver alert monitor.

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

Warranty

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There are over 42 percent more Mercedes dealers than there are Acura dealers, which makes it easier should you ever need service under the GLB’s warranty.

Reliability

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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 Acura vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 16 more problems per 100 vehicles, Acura is ranked 24th.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Mercedes vehicles are more reliable than Acura vehicles. J.D. Power ranks Mercedes 13th in reliability, above the industry average. With 37 more problems per 100 vehicles, Acura is ranked 26th.

From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Mercedes vehicles are more reliable than Acura vehicles. Consumer Reports ranks Mercedes 7 places higher in reliability than Acura.

Engine

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As tested in Car and Driver the Mercedes GLB 250 is faster than the Acura RDX:

GLB

RDX

Zero to 60 MPH

6 sec

6.6 sec

Zero to 100 MPH

17.1 sec

18.1 sec

5 to 60 MPH Rolling Start

6.9 sec

7 sec

Quarter Mile

14.7 sec

15.2 sec

Speed in 1/4 Mile

94 MPH

93 MPH

Top Speed

131 MPH

113 MPH

Fuel Economy and Range

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/08/13

On the EPA test cycle the GLB gets better fuel mileage than the RDX:

MPG

GLB

FWD

2.0 turbo 4-cyl.

23 city/30 hwy

AWD

2.0 turbo 4-cyl.

23 city/31 hwy

RDX

FWD

2.0 turbo 4-cyl.

22 city/28 hwy

A-Spec 2.0 turbo 4-cyl.

22 city/27 hwy

AWD

2.0 turbo 4-cyl.

21 city/27 hwy

A-Spec 2.0 turbo 4-cyl.

21 city/26 hwy

Transmission

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/08/13

The GLB offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The RDX doesn’t offer an SMG or a conventional manual transmission.

Brakes and Stopping

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For better stopping power the GLB’s brake rotors are larger than those on the RDX:

GLB

RDX

Front Rotors

13 inches

12.4 inches

Rear Rotors

12.6 inches

12.2 inches

The GLB stops much shorter than the RDX:

GLB

RDX

70 to 0 MPH

157 feet

177 feet

Car and Driver

Tires and Wheels

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

Suspension and Handling

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The GLB’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 RDX doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the GLB’s wheelbase is 3.1 inches longer than on the RDX (111.4 inches vs. 108.3 inches).

The GLB 250 4MATIC handles at .89 G’s, while the RDX A-Spec AWD pulls only .81 G’s of cornering force in a Car and Driver skidpad test.

Chassis

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The GLB is 4.4 inches shorter than the RDX, making the GLB easier to handle, maneuver and park in tight spaces.

Passenger Space

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The GLB offers optional seating for 7 passengers; the RDX can only carry 5.

The GLB has 1.1 inches more front headroom and 1 inch more rear headroom than the RDX.

For enhanced passenger comfort on long trips the GLB’s middle row seats recline. The RDX’s rear seats don’t recline.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Mercedes service is better than Acura. J.D. Power ranks Mercedes fifth in service department satisfaction. With a 4% lower rating, Acura is ranked 6th.

Ergonomics

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Unlike the driver-only memory system in the RDX, the GLB has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The GLB’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The RDX’s standard intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.

To help drivers avoid possible obstacles, the GLB offers optional cornering lights to illuminate around corners when the turn signals are activated. The RDX doesn’t offer cornering lights. The GLB also offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle.

The GLB offers optional massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the RDX.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes GLB offers an optional wireless phone charging system (Qi) in the center console. The RDX doesn’t offer wireless personal charging.

The GLB 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 RDX doesn’t offer a house-current electrical outlet.

The GLB’s optional Active Parking Assist can parallel park by itself, stopping and changing direction automatically. The RDX doesn’t offer an automated parking system.

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