 Jaguar responded to the criticism with the introduction of the fourth generation XJ, launched in 2009.Its exterior styling is a departure from previous XJs, with a more youthful, contemporary stance, following the design shift that came into effect previously with the company's XF and XK models.The 5-litre V8 engine in the XJ Supersport can accelerate the car from in 4.7 seconds, and has a UK emission rating of 289 g/km.