AMG has incorporated cylinder deactivation technology, which plays its part in the G 63 achieving an official combined fuel consumption figure of 21.4 mpg. (evo.co.uk)
I have always achieved within 2mpg of official combined fuel consumption figures with my previous cars, but the Santa Fe averages 38mpg (8mpg below the official figure). (whatcar.com)
Turbo - diesel models develop 147kW / 441Nm with an ADR Combined fuel consumption figure of 7.2 L / 100 km (190g / km). (motoring.com.au)