The twin-turbochargers in the new model are equipped with Porsche's Variable Turbine Geometry, or VTG, technology. VTG uses moveable turbo vanes which, depending on the flow rate of the engine's exhaust gases, adjust their angle to achieve an optimal air flow. Also available for the first time on the 911 Turbo is direct fuel injection, which, as the name suggests, shoots fuel directly into the combustion chamber at an extremely high pressure, optimizing performance, efficiency and fuel economy. Combine all this with variable valve timing and a new intake manifold, which allows the engine to breathe easier than before, and the result is more speed and consistent acceleration than you know what to do with. It's also remarkably efficient for a top-of-the-line sports car; official numbers aren't yet available, but it should overshadow the last Turbo's 16 mpg city and 23 mpg highway.