On the downside, the RX 400h drones under light throttle and the sound it makes under acceleration is not entirely pleasing, either. In some test vehicles we could feel the gas V6 kick on and off, and it’s a lurch you won’t feel in other Lexus products. Also, there’s a little torque steer, or at least something that feels like torque steer: Pull up to a stop sign, stand on the gas and make a right turn, and you’ll feel a slight tug on the steering wheel or a resistance to turning. The brakes may be the most un-Lexus-like component of the RX 400h. They stop the car with authority, no worries there. But they sometimes feel uneven, as the regenerative effect of the electric motors helped slow the car, which makes it more challenging to modulate the pedal for smooth stops, particularly at parking lot speeds.

The RX 350’s brakes are smooth and respond with good pedal feel in all circumstances. Its brakes are relatively large and the anti-lock braking system is well tuned, helping a driver maintain steering control during emergency stops. The system features Electronic Brake-force Distribution, which directs braking effort in proportion to weight bias and brake loading for improved stability under hard braking, and Brake Assist, which is designed to sense panic braking and to maintain full braking pressure, even if the driver makes the common mistake of relaxing pressure on the brake pedal.

Both models have Vehicle Stability Control, which helps the driver stay on the intended path on slippery surfaces. New for 2008, a cut-off switch allows the driver to turn off the stability and traction control functions.

The handling of the RX 400h is a bit more responsive and it feels sportier than the RX 350 without the Performance Package. The 400h suspension is firmer, and it corners with less lean. Its optional 18-inch wheels come fitted with stickier tires.

All Lexus RX models are nearly immune to road noise, even with the large greenhouse and expansive glass, and there’s very little wind noise. Lexus engineers took the time to aerodynamically shape the roof rack for quieter running.

The all-wheel-drive system on models so equipped automatically routes power to the wheels with the best grip and works with the ABS to slow any wheel that slips and spins. The RX 350 is not a serious off-road vehicle, as it has no under-body armor, low-range or locking differentials. Yet if you tread lightly, it’s fine for unpaved roads.

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