2020 Acura RDX vs. 2019 Lexus RX Series

Detailed Review, Specifications & Comparison

Your buying experience includes...

business_centerProfessional Staff
account_balanceSimple Financing
local_gas_stationFull Tank of Gas
local_car_washFree Car Wash


Both the RDX and the RX Series have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, 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, lane departure warning systems, rearview cameras, available all wheel drive, blind spot warning systems, around view monitors and rear cross-path warning.

The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the Acura RDX is safer than the Lexus RX Series:


RX Series



4 Stars

4 Stars

Neck Injury Risk



Neck Stress

262 lbs.

546 lbs.

Neck Compression

23 lbs.

135 lbs.

Leg Forces (l/r)

328/464 lbs.

499/536 lbs.



4 Stars

4 Stars

Neck Injury Risk



Neck Stress

99 lbs.

290 lbs.

Neck Compression

84 lbs.

90 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard front crash prevention system, and its headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the RDX its highest rating: “Top Pick Plus” for 2019, a rating granted to only 46 vehicles tested by the IIHS. The RX Series has not been fully tested, yet.


There are over 12 percent more Acura dealers than there are Lexus dealers, which makes it easier should you ever need service under the RDX’s warranty.


The RDX’s 2.0 turbo 4-cyl. produces 12 lbs.-ft. more torque (280 vs. 268) than the RX 350’s standard 3.5 DOHC V6.

As tested in Motor Trend the Acura RDX is faster than the Lexus RX Series:


RX 350

RX 450h

Zero to 60 MPH

6.4 sec

6.8 sec

7 sec

Quarter Mile

14.8 sec

15.1 sec

15.3 sec

Speed in 1/4 Mile

94.7 MPH

92.7 MPH

94.3 MPH

Fuel Economy and Range

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




2.0 turbo 4-cyl.

22 city/28 hwy

A-Spec 2.0 turbo 4-cyl.

22 city/27 hwy


2.0 turbo 4-cyl.

21 city/27 hwy

A-Spec 2.0 turbo 4-cyl.

21 city/26 hwy

RX Series


350 3.5 DOHC V6

20 city/27 hwy


350 3.5 DOHC V6

19 city/26 hwy

To lower fuel costs and make buying fuel easier, the Acura RDX uses regular unleaded gasoline (premium recommended for maximum performance). The RX 450h requires premium, which can cost 20 to 55 cents more per gallon.

The RDX has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The RX Series doesn’t offer a cap-less fueling system.


A 10-speed automatic is standard on the Acura RDX, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the RX Series.

Brakes and Stopping

The RDX stops shorter than the RX Series:


RX Series

60 to 0 MPH

116 feet

123 feet

Motor Trend

Tires and Wheels

For better traction, the RDX A-Spec’s tires are larger than the largest tires available on the RX Series (255/40R20 vs. 235/65R18).

The RDX’s standard tires provide better handling because they have a lower 55 series profile (height to width ratio) that provides a stiffer sidewall than the RX Series’ standard 65 series tires. The RDX A-Spec’s tires have a lower 40 series profile than the RX Series’ optional 55 series tires.

For better ride, handling and brake cooling the RDX has standard 19-inch wheels. Smaller 18-inch wheels are standard on the RX Series.

The RDX has a standard easy tire fill system. When inflating the tires, the vehicle’s integrated tire pressure sensors keep track of the pressure as the tires fill and tell the driver when the tires are inflated to the proper pressure. The RX Series doesn’t offer vehicle monitored tire inflation.

Suspension and Handling

The RDX AWD handles at .81 G’s, while the RX 450h AWD pulls only .78 G’s of cornering force in a Motor Trend skidpad test.


The Acura RDX may be more efficient, handle and accelerate better because it weighs about 450 to 650 pounds less than the Lexus RX Series.

The RDX is 5.7 inches shorter than the RX Series, making the RDX easier to handle, maneuver and park in tight spaces.

The RDX uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The RX Series doesn’t offer active noise cancellation.

Passenger Space

The RDX has .2 inches more front headroom, 1.9 inches more front shoulder room and .4 inches more rear legroom than the RX Series.

Cargo Capacity

The RDX has a much larger cargo volume with its rear seat up than the RX Series with its rear seat up (31.1 vs. 18.4 cubic feet). The RDX has a much larger cargo volume with its rear seat folded than the RX Series with its rear seat folded (79.8 vs. 56.3 cubic feet).


The RDX’s standard towing capacity is much higher than the RX Series’ (1500 vs. 0 pounds).


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 RDX’s standard headlights were rated “Good” by the IIHS, while the RX Series’ headlights are rated “Acceptable” to “Marginal.”

Economic Advantages

According to The Car Book by Jack Gillis, the RDX is less expensive to operate than the RX Series because typical repairs cost much less on the RDX than the RX Series, including $730 less for a water pump, $180 less for a muffler, $197 less for a starter, $50 less for fuel injection, $1688 less for a timing belt/chain and $918 less for a power steering pump.

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

How much is your car worth?

Get the best value for your car from an Asbury dealership.

Featured Videos