Lexus RX 400h: A Stylish Hybrid SUV
The term “soccer mom” defined perhaps too well how many mothers lived the child-rearing parts of their lives in the 1990s. They hated that researchers could predict their voting and buying patterns just because they drove slab-sided Dodge Caravans and repair-prone Ford Windstars. That—and clunky design—helped dampen enthusiasm for the minivan.
Fast forward 15 years, add a slew of energy-saving technology, and you’ve got a near-perfect minivan-replacement vehicle for parents who chauffeurs kids to lacrosse matches: the Lexus RX 400h hybrid-drive SUV. The superb audio and Bluetooth phone technology make traffic jams en route to the office more bearable, too.
In the RX 400h, Lexus mated a V6 gasoline engine with a continuously variable transmission and placed a bank of nickel metal hydride batteries under the back seat. It also put electric-drive motors both front and rear for great fuel economy in town, reasonable acceleration, passable fuel economy on the highway, and as-needed all-wheel drive. If the majority of your driving is done around town and you need some (but not a lot of) cargo space, the RX 400h could be ideal. Just realize you’ll spend $50,000 to get good gas mileage.
As with other hybrids, the motors that help drive the vehicle also work as generators under deceleration, resisting the energy from the forward motion and converting it to electricity. More than half the kinetic energy is recaptured in the NiMH batteries. As a side benefit, regeneration saves wear and tear on the brakes; and the energy is available the next time you step on the throttle. On the interstate, there’s very little stop and go, which is why fuel economy with hybrids is lower on the EPA’s highway rating. The RX 400h is rated at 31 mpg in the city, 27 mpg on the highway for the 2007 model; the 2008 will be 1 mpg to 2 mpg lower because of revised EPA testing standards, which should be more realistic.
By installing an electric drive motor at the rear wheels, Lexus provides all-wheel-drive capabilities without the need for a bulky driveshaft. Under heavy acceleration or on slippery roads especially, the rear propulsion kicks in. There’s also an electric motor up front, which is important for regenerating the most energy, since more weight is on the front wheels under braking. That’s why the nose of a car pitches down when you step on the brakes and goes up when you accelerate.
How Safe is Silent?
Having electric propulsion up front as well allows for one of the RX 400h’s neatest impress-the-neighbors tricks: When you start the engine, there’s no sound, vibration or exhaust smoke, only a Ready light that comes on after a second or two. Then the RX 400h motors off silently under electric power. If you avoid tromping the throttle or turning on the air conditioner, you can get up to about 20 mph before the gasoline engine kicks in.
Long-time hybrid users may have adapted, but I’m still uncertain about the real-world impact (so to speak) of silent vehicles on kids playing in the driveway or the none-too-bright family pet when you back noiselessly out of the garage. You can order a backup camera as part of the $2,650 navigation package, but there’s no backup sonar, which I believe can be more important than the camera for proactively detecting objects in your path.
I also fear new owners may not realize a hybrid is in gear when they pull into a convenience store or gas station and begin to step out. There is a warming chime, but it’s polite and no more urgent than the chime for an unbuckled seat belt or still-on headlights. Obviously, RX 400h owners would be paying stiffer insurance premiums if roll-away incidents happened a lot, but I think Lexus and others need to think more about this downside of hybrid technology before people get run over.
The $2,650 navigation package also includes the backup camera, energy and consumption monitors, and Bluetooth. Each feature is problematic in minor ways.
The view provided by the backup camera is dim at night. Other automakers have more sensitive cameras or brighter backup lights; on this Lexus, you need to back up with your foot on the brake pedal. There’s also no backing lane overlaid on the display that superimposes the width of the RX 400h as two straight lines and curved lines . And there’s no sonar backup option, which is a valuable adjunct to any backup camera: It’s possible to miss seeing an obstacle on the monitor, but you can’t avoid hearing the warning ping of sonar.
The energy and consumption monitors paint a dazzling, full-screen portrait of where energy is coming from and going to: the gas engine, storage battery, front electric motor/generator, rear electric motor/generator; and the direction the electricity travels. There’s a second screen showing how much energy you’ve used and regenerated in minute-by-minute increments. It’s dazzling for about a week, or when you’ve got a green-loving neighbor on board. But there’s no satisfactory way to tone it down to just a corner of the display, once the initial thrill is gone.
The interior finish is flawless, but what did you expect? It’s a Lexus. The RX 400h has a nice rear-entertainment system for kids; the standard audio is fine, and the upgrade audio is superb. You can play MP3 and WMA files, and there’s a line-in jack for music players and an optional iPod interface. If you have the navigation system and the LCD, the audio or climate controls momentarily drop down across the top inch of the display to show a new station or temperature setting. It’s a nice feature, although Infiniti integrates multiple features better on its LCDs.
The Lexus Web site is simple to use, and you can easily configure your vehicle. Some people use automaker sites so they can avoid salespeople at dealerships for as long as possible, but in the case of Lexus, the dealership experience is about as good as it can be. That’s the advantage of setting up a new dealer network in 1990.with the requirement to treat customers well, rather than take over the corner of Toyota showrooms and put Giant Lexus Sale-A-Thon signs in the window.
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