The RX 350 is Lexus' third-generation midsize car-based luxury SUV, available in either front-wheel drive or all-wheel drive. Lexus introduced the RX 300 at the 1998 North American International Auto Show (NAIAS) in Detroit and the RX 300 became the best-selling Lexus model. In January 2003, the second-generation RX was unveiled at the NAIAS, renamed the RX 330 to reflect its larger-displacement engine. RX 330 production began in Japan and in September 2003 Lexus began production of the RX 330 at an assembly plant in Cambridge, Ontario, Canada, the first Lexus model to be built outside of Japan. The RX 330 became the RX 350 for the 2007 model year with the addition of the 3.5-liter V6 engine. The all-new 2010 Lexus RX 350 incorporates the Lexus L-Finesse design language to update the exterior styling while retaining the familiar RX look. Under the hood, the revised 3.5-liter V6 now produces 275 horsepower and is mated with a new 6-speed Multi-Mode Automatic Transmission with manual-shift mode.
The RX 450h is the luxury hybrid crossover SUV from Lexus, which is redesigned for 2010 and replaces the RX 400h, which has been the top trim level of the RX lineup since it debuted for the 2006 model year. The new RX-450h designation is indicative of the updated Lexus Hybrid Drive, which delivers 295 horsepower and improved fuel economy. The 3.5-liter V6 engine adopts the Atkinson-cycle combustion system, and the 288-volt DC nickel-metal hydride battery pack is lighter and more compact. Available with all-wheel drive or front-wheel drive, the redesigned RX 450h features a new version of the Lexus L-finesse design language while retaining the distinctive RX appearance. The original Lexus RX 300 was the first luxury crossover SUV when it arrived in 1998 as a 1999 model, and the RX 400h followed as the first luxury crossover SUV hybrid. The RX 450h has EPA-estimated fuel economy of 32 mpg city/28 mpg highway for FWD and 30/28 for AWD. A new exhaust-heat recovery system and a cooled exhaust-gas recirculation system both contribute to fuel-economy improvements. A full hybrid, the RX 450h can operate in electric-only or gas-engine-only modes, as well as a combined gas-electric mode with a drive-selectable EV mode for electric-only operation over short distances when circumstances allow. To read more about the 2010 Lexus RX Series, visit MSN Autos