What takes more gas? Jaguar Xtype or Cadillac CTS?

I use to own a jaguar and i kept in mind how much money ive wasted on gas for that baby. But i didnt complaint because i use to love that car however i had to let it go. This summer im planning to get another car...not sure if i should get a jag or a caddy.....any advise?|||the jag x will eat up gas like wind but oh what wind !