Jaguar has updated the XE for the 2018 model year.  The 3 Series-fighting sedan’s entry-level engine is now a turbocharged 2.0-liter that makes 247 horsepower.  A new XE S variant ups the ante with a supercharged 380-horsepower V6 borrowed from the F-Type.  Additional tech features — most of them optional — round out the list of updates.