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, linear steering, and a smooth ride, the Grand Cherokee moves with confidence. Its lavish interior and robust four-wheel-drive system make it akin to a Kia Telluride that’s graduated from off-road boot camp. Unlike its Wrangler 4xe plug-in-hybrid sibling, the Grand Cherokee 4xe is subdued and quiet at speed. At idle, however, a grumpy 46 decibels from the inline-four echo throughout the cabin.

A 270-hp turbo 2.0-liter and two electric motors bring the total output to 375 horsepower and 470 pound-feet of torque, a combination potent enough to make passengers ask, “This is a four-cylinder?” (which, really, is the best compliment a four-cylinder can hope for). We noticed some hesitation when accelerating hard from low speed as the gas engine and electric motor bickered over whose turn it was.

In the Wrangler, we noted this powertrain’s rocky transitions between gas and electric propulsion, although they were somewhat lost amid the Wrangler’s general cacophony. In the vastly more polished Grand Cherokee, the powertrain’s hesitation and its abrupt transitions stand out.

Eventually, the powertrain suffered a more serious fault, and the hybrid system went silent. As a result, we were unable to record an as-tested fuel economy, nor can we provide you with the 4xe’s 75-mph highway fuel-economy results.

We were able to perform instrumented testing before the hybrid-system failure and found that the 4xe is the quickest version of the new Grand Cherokee. It springs to 60 mph in 5.3 seconds and hits 100 mph in 13.9 seconds, right as it reaches a quarter-mile. That’s 0.3 second quicker to 60 mph and 1.3 seconds sooner to 100 than the discontinued V-8 version. When it comes to lugging, the 4xe’s 6000-pound maximum towing capacity is 200 pounds short of the V-6 and 1200 less than the dead V-8 model.