Hearing the Jeep Grand Cherokee 4xe described as the “most fuel-efficient Jeep ever” gives us the warm fuzzies. It feels like a win for the world and makes us want to parade through an aisle at Whole Foods, high-fiving every farm-to-fork enthusiast until our palms turn red. But while the 4xe’s EPA-estimated 56 MPGe and 26 miles of electric-only range are good for a Grand Cherokee, the plug-in-hybrid option is an expensive one. That’s not to downplay the effort by Jeep to reduce its wonderfully luxurious SUV’s usage of gasoline. The Grand Cherokee, which was redesigned last year, is an absolute honey on the road. With a firm brake pedal,…