The 2009 Lexus GS 450h midsize luxury sedan sits atop the GS lineup. It comes equipped with a full array of standard premium luxury features such as 18-inch wheels, adaptive suspension dampers, adaptive xenon headlights and a sunroof. Leather upholstery, heated and cooled front seats with driver memory settings, dual-zone automatic climate control, wood interior trim, Bluetooth, a back-up camera, keyless ignition/entry and a 10-speaker audio system with in-dash CD changer and auxiliary audio jack also come standard.There are a handful of options to choose from, including a navigation system, satellite radio, a phenomenal 14-speaker Mark Levinson audio system, a safety-oriented pre-collision feature with adaptive cruise control, active antiroll bars and a rear spoiler. Conventional summer (performance) tires are standard on the GS 450h, but buyers have the option of getting run-flats in either summer or all-season guise.