Next month at the Frankfurt Motor Show, BMW will be rolling out an extra high mileage Efficient Dynamics Edition of its 320d sedan. Like most European BMWs, this one is powered by a diesel engine that helps it get to 57.36 mpg (U.S.) on the EU combined driving cycle with CO2 emissions of just 109 g/km. This new edition of the 320d gets a number of optimizations to reach these lofty numbers. Under the hood is the mid-range 163 hp single turbo version of BMW's 2.0-liter four cylinder diesel. It sends power through a 6-speed manual transmission and the ED edition gets a taller final drive ratio.

Frankfurt Preview: 2010 BMW 320d Efficient Dynamics Edition, 57.4 mpg (U.S.) — Autoblog Green