The 2007 Jaguar XJ is available as a 4-door, 5-seat sedan. Starting at $63,585, the 2007 Jaguar XJ XJ8 is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 27-mpg on the highway. The top of the line 2007 Jaguar XJ Vanden Plas, priced at $74,835, is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 27-mpg on the highway.