2010 Porsche Panamera – Click above for high-res image gallery

As far as high-end sports cars go, the Porsche lineup is pretty fuel efficient. Light weight and six-cylinder engines usually do the trick, but those attributes don't exactly describe the new Panamera. The large, four-door Porsche comes standard with a bare minimum of 400 horsepower, and while it isn't a Biggest Loser candidate, it won't balance the scales of justice with a GT3 on the opposing dish, either.

Inside Line is reporting that the impressive size and power of the Panamera won't lead to a gas guzzler tax, citing an email from Porsche Cars North America spokesman Gary Fong that reportedly tabs fuel economy for the 4.8-liter, 400-horsepower Panamera S and 4S models at an impressive 16 mpg city and 24 mpg highway. The 500 pony Panamera Turbo will reportedly still have a respectable 15/23 rating. For comparison's sake, Maserati's rival Quattroporte GT S achieves just 12 mpg/18 highway, and it is down 66 horses on the Porsche.

Fuel economy numbers for the Panamera are surprisingly handsome, beating even some sport coupes in the $100,000+ range. Reasons for the car's remarkable fuel economy numbers include its dual clutch transmission and the inclusion of start/stop technology. The Environmental Protection Agency hasn't yet published the official fuel economy numbers for the range, so we'll just have to sit tight for now with these preliminary figures.

Related GalleryFirst Drive: 2010 Porsche Panamera

[Source: Inside Line]