What is the mileage of Mercedes-Benz M-Class on highways and City?

Mercedes-Benz M-Class diesel variant 250 CDI has an engine which can deliver 15.26 Kmpl on the highways, whereas in the city, it settles down to 11.13 Kmpl. The other diesel variant 350 CDI, which has a capacity to give 8 Kmpl under city conditions and on the highways, it can go up about to 11.74 Kmpl. Except this the AMG variant has a fuel economy of 6.36 Kmpl within the city, while it can  out 10.41 Kmpl on the highways.