The new Lexus RX 330 is an advance in this mien. It's notable for its smooth ride even over broken, potholed pavement. Like the previous RX 300, the RX 330 should be good on dirt and gravel roads as well, though we haven't tried this. We found the RX 330 poised in corners, the steering light and accurate. Its fully independent suspension keeps the tires in contact with the pavement for lots of grip.

The 3.3-liter V6 zips the RX 330 to speed (from 0 to 60 mph in 7.8 seconds, according to Lexus). Larger than last year's engine, the V6 develops a healthy 230 horsepower and 242 pounds-feet of torque. Torque is the twist that yields acceleration, and the RX 330's torque peak comes at a relatively low 3600 rpm. This means that this Lexus can accelerate around town without having to rev into the upper ranges, reducing cabin noise and eliminating the frantic feel that engines needing high revs often have.

The RX 330 benefits from a five-speed automatic transmission, which has a lower low gear and a higher high gear than the old RX 300's four-speed automatic. The lower first gear allows quicker dig off the line, good when having to merge into traffic from a standing start. The higher fifth gear allows lower revs at cruise, which translates into quieter running with less engine noise, plus better gas mileage and longer engine life because the engine doesn't go around as many times. At times, the transmission seemed slow to downshift, however.

The RX 330 is free from road noise and wind noise even when equipped with a roof rack. Lexus engineers took the time to aerodynamically shape the roof rack to reduce noise.

The brakes, large discs front and rear, are smooth and have good feel. The RX 330 comes with the latest in braking technology: A four-sensor/four-channel anti-lock brake system helps the driver maintain control of the steering under hard braking. Electronic brake force distribution balances braking forces for shorter stops. Brake Assist senses when the driver is in a panic braking situation and helps ensure full force is being applied.

Rather than using a true four-wheel-drive system with locking center differentials or viscous couplings, the RX 330 uses the antilock brake system to prevent wheel spin, thereby sending torque to the wheels that still have grip. It's a good setup for slippery pavement, light snow, or gravel. All RX 330 models come equipped with the Vehicle Stability Control system (VSC), which helps prevent a skid.

We also drove an RX 330 with the optional air suspension. This system has four driver-selectable height settings for comfort and convenience. The air suspension lowers the RX 330 by 0.3 inches at speeds over 62 mph for reduced air drag for better handling and fuel economy. Drivers can select a mode that lowers the car by 0.6 inches for better cornering and a more sedan-like ride. Rough and unpaved roads that require greater ground clearance can be accommodated by selecting the High position, which puts an additional 1.2 inches underneath the RX 330 at speeds up to 30 mph. An Access mode, which lowers the RX 330 for easier entry and exit, can be selected with the transmission in Park, or it can be programmed go to this position automatically when the ignition is turned off. It's available as part of the Performance Package.