Understandably, all eyes at Porsche's Frankfurt auto show stand will be turned towards the spanking new 911 Carrera and Carrera S Coupes, but the Germans will also celebrate the first public outing of their diesel-powered Panamera, details of which were announced earlier this year. The most fuel-efficient variant of the Panamera sports sedan to date is fitted with an Audi-sourced 3.0-liter turbocharged V6 common-rail diesel pumping out 250-horsepowerand a brawny maximum torque of 550Nm (406 lb-ft).   

Power is channeled to the rear wheels through an eight-speed auto. While the Panamera Diesel can dash from zero to 100 km/h (62mph) in a zippy 6.8 seconds and reach a top speed of 242km/h (150 mph), what sets it apart from the other members of Porsche's family is its low fuel consumption. When fitted with standard tires, the diesel model returns a combined fuel economy of 6.5 lt/100 km (36.2mpg US or 43.5mpg UK) with CO2 emissions of 172 g/km CO2, while these numbers drop to 6.3 lt/100 km (equal to 37.3mpg US or 44.8mpg UK) and 167 g/km CO2 respectively, when opted with low rolling resistance tires.