The 350 and 450h both carry a 3.5L V6 under the hood. The 350 is rated at 275 horsepower, while the 450h can do a combined 295 horsepower, thanks to the assistance of the hybrid powertrain's electric motor. The 350 uses a conventional 6-speed transmission, but the 450h comes with a continuously variable transmission.
The 450h hybrid system includes a 288-volt battery pack that sits under the rear seat, sending power to the front mounted motor-generator that drives the front wheels. In all-wheel drive trims, a second motor-generator drives the rear wheels. Both models also carry an engine-driven generator to functions as a starter and a charger for the battery pack.
Lexus boasts a handling system called Vehicle Dynamics Integrated Management (VDIM); it's standard on the 450h and optional on the 350. If the system detects a loss of control, it uses an array of electronic systems ? anti-lock brakes, brake assist, traction control, stability control and throttle control to help the RX get back on track.
Further safety options include adaptive headlights and a pre-collision system with Dynamic Radar Cruise Control to set the RX's speed in relation to the car ahead. The RX has 10 standard airbags, a rollover sensor to inflate side curtain airbags and active front headrests. Inside, the RX features push-button start, 10-way power seats with memory, steering-wheel mounted controls, Bluetooth connectivity, and the Lexus Premium Audio system. Options include a smog detector, leather seats, rear-seat entertainment system, 15-speaker Mark Levinson surround-sound system, navigation system and back-up camera.
Smooth Ride
Lexus-worthy Quiet Cabin
Plenty Of Room For People And Cargo
An Appearance Package is new for 2012, and includes 19-inch wheels and black headlamp trim. Otherwise, the RX is virtually unchanged from the 2011 model.
The RX 350 and RX 450h are categorized as full-sized luxury SUVs, and they carry the amenities and horsepower to back it up. The 450h features a hybrid drivetrain that can run on batteries alone for short distances to save fuel. The 350 does all right on its own, achieving 18 mpg city and 25 mpg highway, but the 450h really shines with 28 mpg city and 32 mpg highway.
