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To help make backing safer, the RDX’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The QX30 doesn’t offer a cross-path warning system.
Compared to metal, the RDX’s plastic fuel tank can withstand harder, more intrusive impacts without leaking; this decreases the possibility of fire. The Infiniti QX30 has a metal gas tank.
Both the RDX and the QX30 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, rearview cameras, available all wheel drive, blind spot warning systems and around view monitors.
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 QX30 has not been tested, yet.
There are over 27 percent more Acura dealers than there are Infiniti dealers, which makes it easier should you ever need service under the RDX’s warranty.
The RDX’s 2.0 turbo 4-cyl. produces 64 more horsepower (272 vs. 208) and 22 lbs.-ft. more torque (280 vs. 258) than the QX30’s 2.0 turbo 4-cyl.
To lower fuel costs and make buying fuel easier, the Acura RDX uses regular unleaded gasoline (premium recommended for maximum performance). The QX30 requires premium, which can cost 20 to 55 cents more per gallon.
The RDX has 3.9 gallons more fuel capacity than the QX30 FWD’s standard fuel tank (17.1 vs. 13.2 gallons), for longer range between fill-ups. The RDX has 2.3 gallons more fuel capacity than the QX30 AWD’s standard fuel tank (17.1 vs. 14.8 gallons).
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 QX30 doesn’t offer a cap-less fueling system.
In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Acura RDX higher (6 out of 10) than the Infiniti QX30 (3). This means the RDX produces up to 23.4 pounds less smog-producing pollutants than the QX30 every 15,000 miles.
A 10-speed automatic is standard on the Acura RDX, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the QX30.
For better traction, the RDX A-Spec’s tires are larger than the largest tires available on the QX30 (255/40R20 vs. 235/50R18).
The RDX A-Spec’s tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the QX30’s optional 45 series tires.
For better ride, handling and brake cooling the RDX has standard 19-inch wheels. Smaller 18-inch wheels are standard on the QX30. The RDX A-Spec’s 20-inch wheels are larger than the 19-inch wheels optional on the QX30.
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 QX30 doesn’t offer vehicle monitored tire inflation.
The RDX AWD has a standard space-saver spare (not available on A-Spec) so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the QX30; 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.
The RDX 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 or off-road. The QX30’s suspension doesn’t offer adjustable shock absorbers.
For a smoother ride and more stable handling, the RDX’s wheelbase is 2 inches longer than on the QX30 (108.3 inches vs. 106.3 inches).
For better handling and stability, the track (width between the wheels) on the RDX is 2.4 inches wider in the front and 2.8 inches wider in the rear than the average track on the QX30.
For greater off-road capability the RDX has a greater minimum ground clearance than the QX30 (8.2 vs. 8 inches), allowing the RDX to travel over rougher terrain without being stopped or damaged.
The RDX uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The QX30 doesn’t offer active noise cancellation.
The RDX has 15.2 cubic feet more passenger volume than the QX30 (104 vs. 88.8).
The RDX has 1.2 inches more front headroom, .3 inches more front legroom, 2.9 inches more front hip room, 4.9 inches more front shoulder room, .8 inches more rear headroom, 4.9 inches more rear legroom, .9 inches more rear hip room and 3.5 inches more rear shoulder room than the QX30.
The RDX has a much larger cargo volume with its rear seat up than the QX30 with its rear seat up (31.1 vs. 19.2 cubic feet). The RDX has a much larger cargo volume with its rear seat folded than the QX30 with its rear seat folded (79.8 vs. 34 cubic feet).
Pressing a switch automatically lowers the RDX’s rear seats, to make changing between passengers and cargo easier. The QX30 doesn’t offer automatic folding seats.
To make loading and unloading groceries and cargo easier, especially for short adults, the RDX has a standard power liftgate, which opens and closes automatically by pressing a button, or on the RDX Advance, by just kicking your foot under the back bumper, completely leaving your hands free. The QX30 doesn’t offer a power liftgate.
The RDX has a 1500 lbs. towing capacity. The QX30 has no towing capacity.
The RDX uses gas struts to support the hood for easier service access. The QX30 uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.
The RDX 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 QX30 doesn’t offer a remote starting system.
The RDX Advance has a standard 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 QX30 doesn’t offer a heads-up display.
The power windows standard on both the RDX and the QX30 have locks to prevent small children from operating them. When the lock on the RDX is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The QX30 prevents the driver from operating the other windows just as it does the other passengers.
The RDX’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 QX30’s rear power window switches have to be held the entire time to open or close them fully.
The RDX’s standard speed-sensitive wipers speed up when the vehicle does, so that the driver doesn’t have to continually adjust the speed of the wipers. The QX30’s standard manually variable intermittent wipers have to be constantly adjusted.
To improve rear visibility by keeping the rear window clear, the RDX has a standard rear fixed intermittent wiper with a full on position. The rear wiper standard on the QX30 only has an intermittent setting, so in a hard rain visibility isn’t as good.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the RDX has standard extendable sun visors. The QX30 doesn’t offer extendable visors.
The RDX has standard heated front seats. Heated front seats are only available on the QX30 Luxe/Sport/Essential. The RDX Advance also has standard heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the QX30.
Optional air-conditioned seats in the RDX keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The QX30 doesn’t offer air-conditioned seats.
On extremely cold winter days, the RDX’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the vehicle heater warms up. The QX30 doesn’t offer a heated steering wheel.
Insurance will cost less for the RDX owner. The Complete Car Cost Guide estimates that insurance for the RDX will cost $2280 to $3875 less than the QX30 over a five-year period.
According to The Car Book by Jack Gillis, the RDX is less expensive to operate than the QX30 because typical repairs cost much less on the RDX than the QX30, including $334 less for a water pump, $174 less for a muffler, $115 less for fuel injection, $30 less for front struts, $476 less for a timing belt/chain and $226 less for a power steering pump.
The Acura RDX outsold the Infiniti QX30 by almost 8 to one during 2018.
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