The 1999 Jaguar XK8 is available as a 2-door, 4-seat coupe. Starting at $65,750, the 1999 Jaguar XK8 Coupe is powered by a 4.0L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway. The top of the line 1999 Jaguar XK8 Convertible, priced at $70,750, is powered by a 4.0L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.