Porsche Cayenne S.

Mileage: 17,1 l/100 km (in town), 11,7 l/100 km (highway)

C0₂ emissions: 378 g/km (test done by "Le Figaro", 15.10.2007, see here).
C0₂ emissions for all models of Porsche Cayenne: 329 - 378 g/km. see here.

Image credit: http://www.autoblog.com/tag/cayenne%20s/