Protection Agency (EPA) estimates. The engine itself runs on the Atkinson cycle and by itself makes 275 hp. The ML 450 was developed under the Global Hybrid Cooperation, and will only be available in the United States under lease. In 2011, Mercedes-Benz came out with their flagship SUV model, the Mercedes-Benz M BlueTec Grand Edition. The vehicle had cosmetic changes, including specially-manufactured 22-inch 10 spoke wheels, black leather with white stitching, and smokers package with Grand Edition modeling. The exterior consisted of new wheels, tinted headlights and tail lights, xenon-package (LED tail lights and daytime running lights, Xenon headlights), black grille, AMG, and side-view mirrors. The Grand Edition was offered in Midnight Blue, Black, and Ivory White, differentiating the basic model by colour already. The interior had changes, including deletion of the heated steering wheel and the replacement with an AMG steering wheel. Engines (2005-2011) Third generation (W166; 2011) In 2006, development began on the next-generation M-Class and spanned over a period of 5 years, a shorter duration than its predecessor. In 2008, the final design by Emiel Burki was approved and patented domestically on 16 December 2008 (U.S. design patent filed on 15 June 2009). The newly redesigned M-Class (chassis name W166) was introduced in pre-production form 10 June 2011 as a 2012 model. The first customer-designated W166 rolled off the Vance production line on 20 July. It is moderately refined, taking styling cues from the new generation Mercedes-Benz E-Class. An increase in rear seat legroom has been implemented, alongside adjustable rear backrests. It was to be launched in September 2011. New features in the 2012 M-Class include an updated 7G-Tronic Plus seven-speed automatic transmission to provide improved fuel economy, optional adaptive cruise control (Distronic Plus), active lane departure warning system, and an adjustable-height air suspension (AirMatic). An active curve system with active anti-roll bars for body roll compensation was introduced. The W166 was one of the last vestiges of the joint venture between Daimler and Chrysler while they were a consolidated company. DaimlerChrysler developed the core platform and technology, benefitting from Chrysler's strong SUV sales and R&D domestically. The underlying platform work was largely completed in 2006, as the two companies were separated. Chrysler uses the same platform to power the Jeep Grand Cherokee (WK2) and Dodge Durango. Because of the separation however, the cars are extremely different in terms of interior and body design as well as