The change from the 5.0 litre V8 engine to a new 3.0 litre V6 supercharged engine has helped Jaguar to cut CO2 emissions on the XJ model, which experienced an 11% rise in sales during 2011.
The petrol-fuelled model has cut CO2 emissions from 268g/km to 224g/km and the diesel variant of the new XJ is expected to achieve 47 miles per gallon while emitting 159g/km of CO2, a 14% improvement.
To maximise efficiency from the all-aluminium architecture of the XJ, Jaguar has introduced an eight-speed ZF transmission with intelligent stop-start. As seen on the XF, these developments lead to lower fuel consumption and emissions.
The 13MY XJ has introduced of a new 3.0-litre, supercharged V6 powertrain, which provides more power per litre of fuel than the previous model. Making its debut in the XJ and XF, this engine will also power the forthcoming F-type sports car, available from 2013.
Jaguar has invested in improving suspension refinement and performance by incorporating re-calibrated spring and damper tunes as well as remapped damper software, which will increase comfort.
Teaming up with British audio firm Meridian, Jaguar engineers have also developed a new sound system. The Meridian system has significantly lower levels of harmonic distortion – meaning a lower power output is required to achieve the high levels of audio clarity within the vehicle.