Hello; Peterbilt has unveiled a new version of its Peterbilt Model 579 flagship truck that offers a 7% fuel economy improvement compared with the current 579 truck. The new Peterbilt 579 interior model is designed to be more quieter in the cab (by 10%) and it comes with various technology upgrades and assistant systems such as: driver configurable digital dashboard cluster, lane keeping assist and lane departure warning. The Model 579 truck is available for order in many configurations which include: a day cab version, an integral 80 inch Peterbilt 579 UltraLoft sleeper and a variety of other 579 sleeper sizes. The sleeper cab in the Peterbilt 579 UltraLoft model features an impressive 70 cubic feet of space and an 8 foot high ceiling. The cabin also has space for small appliances like a 1.1 cubic foot microwave, a 32" LED TV, a tall wardrobe closet, multiple power outlets (including USB). In the new Peterbilt 579 UltraLoft cabin you can also order an optional bunk bed with a fold away ladder. Other small extras like a fixed cup holder and the option for multiple USB charging ports are intended to make driver's life more comfortable.