Jaguar's Intelligent Start-Stop system is now included across the range, with the manufacturer claiming that the time taken to restart the engine is less than the time taken for the driver's foot to move from the brake to the accelerator. The car has a secondary battery fitted purely to power the start-stop system.
Inside, long-wheelbase versions of the new XJ get airline-style reclining rear seats with a massage function, plus increased headroom and a new infotainment system. The rear suspension of the LWB XJ has also been upgraded to improve rear ride comfort.
A unique addition to the Jaguar, which is part of the upgraded audio system, is the 'Conversation Assist' feature. It uses microphones above each occupant and uses processing technology to 'reinforce' the occupant's voice through the car's speakers, making it easier for occupants to hear each other.