A funny thing happened to Jaguar on the way to EPA certification. Its all-new 2017 XE sedan posted identical fuel-economy estimates with its four- and six-cylinder engines. In the rear-wheel-drive models, both the 2.0-liter turbocharged inline-four and the 3.0-liter supercharged V-6 deliver 21 mpg city and 30 mpg highway, according to Jaguar and the EPA. At least until we can run our own fuel-economy test on U.S.-spec cars, this suggests there is no penalty for grabbing an extra 100 horsepower and 81 lb-ft of torque. Adding all-wheel drive to the V-6, which isn’t available with the gasoline four, nets a slightly lower figure of 20 mpg city and 29 mpg highway. The 2.0-liter turbo-diesel inline-four, as expected, plays in another league efficiency-wise. Rear-wheel-drive diesel models achieve 32 mpg city and 42 mpg highway according to the EPA; all-wheel-drive cars lose 2 mpg in both tests. That matches the 2016 BMW 328d xDrive’s 30/40-mpg rating, the only competitor to currently offer a diesel. Instrumented Test: 2017 Jaguar XE S 2017 Jaguar XE Will Offer a Manual Transmission in the U.S. 2018 Jaguar XE SVR: 5.0 Liters of Supercharged Fury? All XE models come with an eight-speed automatic transmission and auto stop/start. Later, a six-speed manual will be available with the gasoline four-cylinder. When the XE SVR arrives, expect city fuel economy to dip down into the teens—as if anyone choosing that high-performance model will care.