British automaker is dropping its all-V8 lineup to offer smaller turbocharged and supercharged engines in the XF and XJ sedans this fall.

AutoWeek ?á|?áhttp://www.autoweek.com/ ?á|?á Posted?áJuly 16, 2012 ?á Mahwah, NJ

Jaguar hasn't offered a four-cylinder engine since 1948 and no V6 since the small, lackluster X-Type was pulled from the United States four years ago. But in an era of mpg obsession, even this proud British luxury brand is changing.

Jaguar will offer four- and six-cylinder engines in two of its three car lines, starting this fall.

"We have only V8s in a market that has moved to six-cylinder," said Andy Goss, CEO of Jaguar Land Rover North America.

A 2-liter, 240-horsepower turbocharged four-cylinder from the Range Rover Evoque will be available on the XF sedan, the four-door that competes with the BMW 5-series, Cadillac CTS and Mercedes-Benz E350.

A supercharged 3-liter V6 in two variants ÔÇô 340 and 380 horsepower ÔÇô will be offered on the XF and the larger XJ sedan. The V6 is based on the 5-liter V8, now the only engine Jaguar offers on U.S. cars.

Goss said the V6 in particular will be a game changer for Jaguar. About 70 percent of cars in the segment in which the XF competes are sold with V6 engines, he said.

"With the V8, we are fishing in a small pond," he said.

Both new engines will be teamed with an eight-speed automatic transmission, replacing a six-speed automatic. Fuel economy ratings won't be available until August.

The new engines and transmissions will not be available on the XK convertible or coupe.