The 2011 Jaguar XK and XKR are near-exotic sportscars with supremely powerful -8 engines. That means fuel economy takes a hit--but not quite as much of a hit as it could, since the XK sportscars are built from lighter-weight aluminum.
The EPA rates the 385-horsepower 2011 XK coupe at 16/24 mpg, for its sole rear-drive, automatic-equipped powertrain. As a convertible, the fuel economy drops on the highway cycle, to 16/22 mpg.
With the addition of a supercharger to the 510-hp XKR's V-8, gas mileage slips even more, to 15/22 mpg.
Jaguar plans no hybrid nor electric versions of the XK. Could you just imagine?