The Porsche 991 on sale from December 2011, is the seventh generation of Porsche 911. It represents the most important technical leap in the evolution of the 911. The 911 new generations raises the level of performance and efficiency to new levels. The completely new chassis with a longer wheelbase, wider tracks, increased tire height and an ergonomically optimized interior, all stand to make the sporting experience even more comfortable and easier to drive. Technically, the 911s are the culmination of Porsche's performance allowing for even lower fuel consumption with even higher performance. This is due in part to the 3.4-liter placement in the Carrera model developing 5 hp more than the 997 3.6-liter second generation and also to its hybrid steel / aluminum construction, which significantly reduces weight.Other innovations include Dynamic Chassis Control (PDCC) and the world's first seven-speed manual transmission.