The 2012 Jaguar XJ is available as a 4-door, 5-seat sedan. Starting at $73,700, the 2012 Jaguar XJ Base is powered by a 5.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway. The top of the line 2012JaguarXJXJL Supersport , priced at $ 117,700 , is powered by a 5.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 22-mpg on the highway.